Meter Bridge (Product Code: SCL-341/069) is a one-metre slide-wire bridge used to determine unknown resistance and the resistivity of a wire in school and college physics laboratories. A single 1 m length of 24 SWG bare constantan wire runs along a rule divided in centimetres and millimetres on a powder-coated aluminium extrusion, and a jockey is supplied. It is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the Meter Bridge Used For?

The meter bridge works on the Wheatstone bridge principle: with a known resistance on one side and the unknown on the other, the jockey is tapped along the wire until a galvanometer reads zero, and the balancing length gives the unknown value. Classes use it to find the resistance and specific resistance of a wire, to verify series and parallel combinations, and to compare two resistances.

Measuring the wire's diameter with a screw gauge alongside the balancing lengths lets students calculate resistivity, a standard physics practical at senior secondary level and a routine item in any meter bridge lab. Tap the jockey rather than sliding it, interchange the known and unknown resistances and average the results, and keep the constantan wire free of kinks.

What to Specify When Ordering

• Number of meter bridges needed, usually one per student group.
• Whether a galvanometer, resistance box, plug key and cell should be quoted with it.
• Spare jockeys or replacement constantan wire, if your laboratory keeps them in stock.

OEM Manufacturer

Jain Scientific Equipments Private Limited, known to customers as ScienceLab, is the OEM for this meter bridge and produces it at its own licensed factory at Saha, Ambala, Haryana, India, rather than buying it in from a trader. Institutions and dealers can order factory-direct, and questions about replacement wire or jockeys go straight to the manufacturer. Read about the company on the ScienceLab profile page.

Related Physics Lab Equipment

For resistance and resistivity practicals on the meter bridge, laboratories usually add:

• Moving Coil Galvanometer — centre-zero detector for locating the balance point.
• Resistance Box — the known resistance for the comparison.
• Screw Gauge — measures wire diameter for resistivity calculations.
• Constantan Wire — sample wire for resistance and resistivity experiments.
• Jockey — a spare sliding contact for student sets.

The Physics Lab category lists further bridge and circuit apparatus.

Frequently Asked Questions

What wire is used on the Meter Bridge?
The Meter Bridge uses a single 1 m length of 24 SWG bare constantan wire. Constantan is chosen for bridge wires because its resistance changes very little with temperature, which keeps balancing lengths steady throughout a practical session.

How does the Meter Bridge minimise end errors?
On the Meter Bridge, the constantan wire is clamped to brass plates by a system designed to make contact at the exact ends of the scale. This leaves virtually no margin for end errors, although interchanging the resistances and averaging remains good practice.

Is a jockey included with the Meter Bridge?
Yes, the Meter Bridge is supplied with a jockey. A galvanometer, resistance box, cell, plug key and connecting leads are needed to complete the circuit, and they can be added to the same quotation on request.

What kind of terminals does the Meter Bridge have?
The Meter Bridge has heavy-duty 4 mm socket terminals on its terminating strips, so it accepts standard 4 mm banana-plug leads. This allows quick, firm connections to the galvanometer, resistance box and cell during class practicals.

Who manufactures the Meter Bridge?
The Meter Bridge is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Schools, colleges, dealers and importers receive quotations straight from the manufacturer.

What should a Meter Bridge quotation request include?
For a Meter Bridge quotation, state the number of units, the accessories you need with them, and the delivery location in India or abroad. Send these details through the contact page and the manufacturer will reply with a quotation.

Request a Quote

To buy the Meter Bridge, use our contact page or the enquiry cart to tell us your quantity. The manufacturer will respond with a quotation.

Last updated: 24 September 2026

Potentiometer, 10 wire (Product Code: SCL-343/070) is a ten-metre slide-wire potentiometer used to compare the emf of cells and measure internal resistance in college and senior school physics laboratories. Ten 1 m lengths of 24 SWG bare constantan wire run over a centimetre- and millimetre-divided scale on a powder-coated aluminium extrusion, giving a long wire for fine balance readings. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the 10-Wire Potentiometer Used For?

A steady driver cell sends current through the full length of wire, so the potential falls uniformly along it; a test cell connected through a galvanometer and the jockey is then balanced at the point where no current flows. Because the test cell supplies no current at balance, the potentiometer measures its true emf, which an ordinary voltmeter cannot do.

Standard experiments include comparing the emfs of two primary cells with a two-way key, finding the internal resistance of a cell using a resistance box, and calibrating an ammeter or voltmeter. A rheostat in the driver circuit sets the potential gradient; keep it unchanged through a set of readings and tap the jockey only lightly. These tasks make it a core item for potentiometer lab practicals.

What to Specify When Ordering

• Number of potentiometers needed per laboratory.
• Whether a driver supply, rheostat, two-way key and galvanometer should be quoted with it.
• Any spare jockeys for student batches.

OEM Manufacturer

The 10-wire potentiometer is produced by Jain Scientific Equipments Private Limited, which trades as ScienceLab and is the OEM, at its own licensed factory at Saha, Ambala, Haryana, India. The company is a registered MSME enterprise (Udyam UDYAM-HR-01-0003714) and ships export consignments under Importer-Exporter Code AAECJ8618A issued by the DGFT. Universities, schools and importers therefore buy direct from the manufacturer, which also handles repeat orders. See the company profile for more.

Related Physics Lab Equipment

Emf comparison and internal-resistance experiments on this potentiometer call for cells, a key, a rheostat and a detector:

• Leclanche Cell — a primary cell whose emf can be measured or compared.
• Deniel Cell — a second cell type for emf comparison.
• Two Way Key — switches between the two cells without rewiring.
• Rheostat 30 Ohm — adjusts the current in the driver circuit.
• Moving Coil Galvanometer — shows the null point.

Browse further electricity apparatus in the Physics Lab category.

Frequently Asked Questions

How long is the wire on the Potentiometer, 10 wire?
The Potentiometer, 10 wire carries ten separate 1 m lengths of 24 SWG bare constantan wire, giving 10 m of wire in total. The long wire lowers the potential gradient, so each centimetre of balancing length represents a smaller voltage and readings are finer.

What experiments is the 10-wire potentiometer used for?
The Potentiometer, 10 wire is used to compare the emfs of two cells, to find the internal resistance of a primary cell and to calibrate voltmeters and ammeters. All of these rely on the null-deflection principle, so the cell under test supplies no current at balance.

What else is needed to use the Potentiometer, 10 wire?
The Potentiometer, 10 wire is supplied with a jockey. A complete set-up also needs a steady driver supply, a rheostat, a galvanometer, a plug or two-way key, cells under test and 4 mm connecting leads; ScienceLab can quote these together.

How does the potentiometer keep end errors small?
The constantan wires of the Potentiometer, 10 wire are clamped to brass plates by a system that makes electrical contact at the exact ends of the scale. This leaves virtually no margin for end errors when balancing lengths are read off the centimetre and millimetre divisions.

Who manufactures the Potentiometer, 10 wire?
Jain Scientific Equipments Pvt Ltd (ScienceLab) manufactures the Potentiometer, 10 wire as the OEM at its own licensed factory in Saha, Ambala, Haryana, India. Quotations for institutions, dealers and importers come directly from the manufacturer, which also supports repeat supply.

Can the Potentiometer, 10 wire be supplied for export?
Yes, the Potentiometer, 10 wire is supplied to buyers in India and international markets. Share the quantity, destination and any accessories through the contact page, and the manufacturer will send a quotation with the details needed for your order.

Request a Quote

Send your Potentiometer, 10 wire requirement through the contact page or add it to the enquiry cart. As the manufacturer, ScienceLab quotes directly.

Last updated: 24 September 2026

Resistance Box (Product Code: SCL-345/071) is a plug-type standard resistance used to insert known values from 1 to 1000 ohm into circuits in school and college physics laboratories. Constantan coils connect across 1/2 inch brass blocks inside a teak wood case, and removing a brass plug brings the matching coil into the circuit. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the Resistance Box Used For?

A plug-type resistance box provides known resistances for circuits that measure voltage, current and resistance. In meter bridge and Wheatstone bridge experiments it forms the known arm, while in Ohm's law and potentiometer work it limits current or acts as the shunt when finding a cell's internal resistance.

Each brass plug shorts out one coil; pulling it out adds that coil's value, so the resistance in circuit is the sum of the unplugged coils. Seat plugs with a gentle twist to keep contact resistance low, and before switching on, check that the right plugs are out — with every plug inserted the box offers practically zero resistance. This makes it a basic resistance box for lab benches in India and abroad.

What to Specify When Ordering

• Range: this box covers 1 to 1000 ohm; a separate higher-range model is listed for galvanometer-conversion work.
• Quantity per laboratory or per student group.
• Companion items such as galvanometers, meter bridges or plug keys.

OEM Manufacturer

ScienceLab is the trading name of Jain Scientific Equipments Private Limited, the OEM that makes this resistance box at its own licensed factory at Saha, Ambala, Haryana, India. The finished boxes go factory-direct to schools, colleges, dealers and importers, and requests for replacement plugs are handled by the manufacturer itself. Visit the company profile to learn more.

Related Physics Lab Equipment

The resistance box is usually paired with bridge apparatus and a detector. Useful companions and alternatives:

• Resistance Box 1-5000 Ohm Range — the higher-range plug box.
• Meter Bridge — uses the box as its known resistance.
• Wheatstone Bridge Apparatus — for resistance comparison by the bridge method.
• Decade Resistance Box — a decade-style alternative for variable resistance.

More resistance and circuit apparatus is in the Physics Lab category.

Frequently Asked Questions

What is the range of this Resistance Box?
This Resistance Box covers 1 to 1000 ohm using constantan coils selected by brass plugs. For experiments that need several thousand ohms, such as converting a galvanometer into a voltmeter, the Resistance Box 1-5000 Ohm Range is the more suitable choice.

How do you read the value on a plug-type Resistance Box?
On a plug-type Resistance Box, the value in circuit is the sum of the coils whose plugs have been removed. Inserting a plug shorts its coil through the brass block, so with all plugs in place the box adds practically no resistance.

What materials is the Resistance Box made of?
The Resistance Box uses constantan coils, 1/2 inch brass blocks, brass plugs and a deluxe-quality teak wood case. Constantan keeps the coil values steady as the room warms, and the brass blocks give low-resistance plug contacts.

Who manufactures the Resistance Box?
The Resistance Box is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), which is the OEM and produces it at its licensed factory in Saha, Ambala, Haryana, India. Schools, colleges and dealers can order direct from the maker and ask it for replacement plugs.

Is a calibration certificate available for the Resistance Box?
The standard listing for the Resistance Box does not include a calibration certificate. If your laboratory or tender needs one, mention it in your enquiry through the contact page, and we will tell you what documentation can be arranged before you order.

How should the Resistance Box be maintained?
Keep the Resistance Box closed and dry when not in use, clean plugs and blocks with a soft dry cloth if readings become unsteady, and seat each plug with a gentle twist. Avoid oiling the contacts, because oil films raise contact resistance and cause errors.

Request a Quote

Tell us how many Resistance Box units you need through the contact page, or add the item to the enquiry cart. Your quotation will come from the manufacturer directly.

Last updated: 24 September 2026

Resistance Box 1-5000 Ohm Range (Product Code: SCL-347/072) is a brass plug-type resistance box used to add known resistances of up to 5000 ohm to circuits in college and senior school physics laboratories. Its wider range suits galvanometer and voltmeter-conversion practicals where a lower-range box is not enough, with constantan coils housed in a teak wood case. It is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the 5000 Ohm Resistance Box Used For?

The higher range is useful when a galvanometer must be converted into a voltmeter, which needs a large resistance in series with its coil, and when finding a galvanometer's resistance and figure of merit by the half-deflection method. It also serves as the known arm in bridge circuits and as a current limiter in potentiometer set-ups.

To set a value, remove the plugs whose coils add up to the resistance you need and leave the rest firmly seated. Start experiments with a high value unplugged and reduce it gradually, which protects sensitive meters from sudden large currents. It is a useful addition to the physics lab instruments in any senior practical room.

What to Specify When Ordering

• Confirm that the 1 to 5000 ohm range suits your experiments; a lower-range Resistance Box is also available.
• Quantity required per laboratory.
• Companion galvanometers, keys or potentiometers to be quoted together.

OEM Manufacturer

Jain Scientific Equipments Private Limited, whose products carry the ScienceLab name, is the original equipment manufacturer of this 1-5000 ohm resistance box. It is made at the company's own licensed factory at Saha, Ambala, Haryana, India, and sent direct to universities, schools, dealers and importers. Repeat orders and spare plugs are handled by the manufacturer — contact us with your requirement. The company profile has more about ScienceLab.

Related Physics Lab Equipment

High-range resistance work usually involves a galvanometer or potentiometer. Items that fit these experiments:

• Moving Coil Galvanometer — the meter converted or tested with the high series resistance.
• Potentiometer, 10 wire — for internal-resistance and calibration experiments.
• Resistance Box — the lower-range plug box for bridge work.
• Resistance Substitution Box — an alternative for selecting set resistance values.

Browse the Physics Lab category for further electricity apparatus.

Frequently Asked Questions

What range does the Resistance Box 1-5000 Ohm Range cover?
The Resistance Box 1-5000 Ohm Range provides known resistances from 1 up to 5000 ohm, selected with brass plugs. The higher upper limit makes it suitable for galvanometer conversion and figure-of-merit experiments that need thousands of ohms in series.

Can this resistance box be used to convert a galvanometer into a voltmeter?
Yes. The Resistance Box 1-5000 Ohm Range can supply the high series resistance needed to convert a galvanometer into a voltmeter of a chosen range. Calculate the value from the galvanometer's resistance and full-scale current, then unplug the matching coils.

How is the Resistance Box 1-5000 Ohm Range constructed?
The Resistance Box 1-5000 Ohm Range has constantan resistance coils, 1/2 inch brass blocks and brass plugs, housed in a deluxe-quality teak wood case. Constantan is used because its resistance stays nearly constant as temperature changes.

Who manufactures the Resistance Box 1-5000 Ohm Range?
Jain Scientific Equipments Pvt Ltd (ScienceLab) is the OEM of the Resistance Box 1-5000 Ohm Range and makes it at its own licensed factory in Saha, Ambala, Haryana, India. Quotations and repeat orders come straight from the manufacturer, not a reseller.

How can meters be protected when using a high-range resistance box?
When using the Resistance Box 1-5000 Ohm Range with a sensitive galvanometer, begin with a large resistance unplugged and reduce it step by step while watching the deflection. Remember that with every plug inserted, the box offers practically zero resistance.

What details are needed for a quotation?
To quote the Resistance Box 1-5000 Ohm Range, we need the quantity, any matching items such as galvanometers or keys, and the delivery location in India or abroad. Send these through the contact page for a quotation direct from the manufacturer.

Request a Quote

Enquire about the Resistance Box 1-5000 Ohm Range through the contact page or add it to the enquiry cart. We reply with a manufacturer's quotation.

Last updated: 24 September 2026

Rheostat 30 Ohm (Product Code: SCL-349/073) is a sliding-contact variable resistor used to control current or divide voltage in school and college physics circuits. With a total resistance of 30 ohm, it suits low-resistance circuits where current must be adjusted in fine steps, and its three terminals let it work as either a rheostat or a potentiometer. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the 30 Ohm Rheostat Used For?

Connected through one end terminal and the slider terminal, it acts as a variable resistor that sets the current in experiments such as Ohm's law, meter bridge and ammeter calibration. Connected across a supply using both end terminals, with the output taken from the slider, it becomes a potential divider that gives a smoothly variable voltage.

A 30 ohm winding changes resistance in small increments, so it is well matched to low-voltage cell circuits and to the driver circuit of a wire potentiometer. Check the maximum current marked on the slider before connecting, start with the slider at the high-resistance end, and move it gradually. It is a practical rheostat for lab benches in schools and colleges.

What to Specify When Ordering

• Resistance value: this model is 30 ohm; a separate Rheostat model is also listed.
• The current your circuit needs, so it can be checked against the rating marked on the slider.
• Quantity per laboratory.

OEM Manufacturer

ScienceLab, the trading name of Jain Scientific Equipments Private Limited, is the OEM of this 30 ohm rheostat and builds it at its own licensed factory at Saha, Ambala, Haryana, India. Because the maker sells direct, buyers get quotations and repeat supplies from the factory itself instead of a middleman, and can ask it about replacement sliders. More about the company is on the ScienceLab profile page.

Related Physics Lab Equipment

A current-control circuit built around this rheostat typically also uses:

• Rheostat — another rheostat model for circuits needing a different value.
• Ammeter — reads the current being adjusted.
• Battery Eliminator 12 Volt — a DC source for the circuit.
• One Way Key — switches the circuit on only while readings are taken.

Other circuit components are listed in the Physics Lab category.

Frequently Asked Questions

What is the resistance of the Rheostat 30 Ohm?
The Rheostat 30 Ohm has a total resistance of 30 ohm, and this value is marked on its slider together with the maximum current capacity. The low total resistance gives fine control of current in low-voltage student circuits.

Can the Rheostat 30 Ohm be used as a potentiometer?
Yes. The Rheostat 30 Ohm has three lock-type brass terminals: one on the sliding contact and two at the ends of the winding. Connecting both ends across the supply and taking the output from the slider turns it into a potential divider.

What current can the Rheostat 30 Ohm carry?
The maximum current capacity of the Rheostat 30 Ohm is marked on the slider of each unit. The listing does not state the figure, so tell us the current your experiment needs through the contact page and we will confirm suitability before quoting.

Who manufactures the Rheostat 30 Ohm?
The Rheostat 30 Ohm is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Schools, colleges and dealers order it directly from the manufacturer, which also handles repeat orders.

What does the double contact system on the rheostat do?
The double contact system on the Rheostat 30 Ohm keeps the slider touching the winding at two points as it moves smoothly along the rod. This gives steadier contact, so the current changes evenly instead of flickering while the slider is adjusted.

How should the Rheostat 30 Ohm be cared for?
Keep the Rheostat 30 Ohm dry, avoid running it above the current marked on the slider, and let the winding cool after long use. If the slider feels stiff, clean the brass guide rod with a dry cloth rather than applying oil.

Request a Quote

Ask for the Rheostat 30 Ohm on our contact page or add it to the enquiry cart with your quantity. The manufacturer quotes you directly.

Last updated: 24 September 2026

Rheostat (Product Code: SCL-351/074) is a 50 ohm sliding-contact variable resistor used to regulate current and set voltages in physics laboratory circuits at schools and colleges. Its higher total resistance gives a wider adjustment range than low-value models, useful when a supply must be held back to a small current, and it can be wired as a rheostat or a potential divider. It is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the 50 Ohm Rheostat Used For?

Teachers use it to limit and vary current in circuits for verifying Ohm's law, studying the heating effect of current, and plotting the characteristics of components such as resistors and bulbs. Wired as a potential divider, it provides a variable voltage from a fixed supply for voltmeter and potentiometer work.

With 50 ohm available, the slider can bring the current well down before the circuit is switched on, which is kinder to meters with small ranges. Check the maximum current marked on the slider, never set the slider to the zero-resistance end while the supply is on, and keep the terminals tight. It is a dependable laboratory rheostat for general current-electricity practicals.

What to Specify When Ordering

• Resistance value: this model is 50 ohm; the Rheostat 30 Ohm is also listed.
• The maximum current your circuit needs, to compare with the rating marked on the slider.
• Quantity required for your laboratory.

OEM Manufacturer

Jain Scientific Equipments Private Limited, trading as ScienceLab, is the OEM for this 50 ohm rheostat and makes it at its own licensed factory at Saha, Ambala, Haryana, India. Institutional and tender buyers who need vendor registration details can use GSTIN 06AAECJ8618A1ZT and LEI 3358004HRD1JIVXKYX49. Quotations and repeat orders come straight from the manufacturer. Read more on the company profile.

Related Physics Lab Equipment

For current-control and voltage-divider experiments with this rheostat, laboratories commonly add:

• Rheostat 30 Ohm — a lower-value option for finer current control.
• Voltmeter — measures the voltage set with the potential divider.
• Milliammeter — reads small currents in the controlled circuit.
• Connecting Wire — for wiring the rheostat into student circuits.

Visit the Physics Lab category for more electricity apparatus.

Frequently Asked Questions

What is the resistance of this Rheostat?
This Rheostat has a capacity of 50 ohm, and the total resistance is marked on the slider along with the maximum current capacity. For finer control in low-resistance circuits, the Rheostat 30 Ohm is also available from ScienceLab.

How is the Rheostat wired as a potential divider?
To use the Rheostat as a potential divider, connect the supply across its two winding-end terminals and take the output between one end and the sliding-contact terminal. Moving the slider then varies the output voltage smoothly from zero up to the full supply.

What terminals does the Rheostat have?
The Rheostat has three lock-type brass socket terminals with proper insulation, so leads stay secure during a practical. One terminal serves the sliding contact, and the other two are joined to the ends of the resistance winding.

Who manufactures the Rheostat?
The Rheostat is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab) as the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Buyers get quotations and repeat supplies directly from the manufacturer, without an intermediary.

What current can the Rheostat carry?
The maximum current capacity of the Rheostat is marked on its slider, but the figure is not given in the listing. Tell us your supply voltage and expected current through the contact page, and we will confirm whether the 50 ohm model suits your circuit.

How should the Rheostat be maintained?
Keep the Rheostat in a dry cupboard, wipe the brass guide rod so the double-contact slider keeps moving smoothly, and check that the brass screw holding the rod stays tight. Do not exceed the current marked on the slider, as overheating can damage the winding.

Request a Quote

Request the 50 ohm Rheostat through our contact page or the enquiry cart. The quotation is sent by the manufacturer.

Last updated: 24 September 2026

One Way Key (Product Code: SCL-353/075) is a plug key used to open and close a single electric circuit in school and college physics practicals. It has two brass blocks with 4 mm terminals on a moulded plastic base, and one accurately tapered brass plug with a fluted plastic top bridges the gap between them with negligible contact resistance. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the One Way Key Used For?

The one way key acts as the on/off switch in nearly every current-electricity practical, from Ohm's law and meter bridge circuits to potentiometer driver circuits. Inserting the plug completes the circuit; removing it breaks the circuit so that no current flows while connections are being changed.

Good practice is to insert the key only while taking a reading and remove it straight afterwards, which stops cells running down and resistance wires heating up. Give the plug a slight twist as it goes in for a firm seat, and keep the tapered surfaces clean. It is a basic item among the physics lab instruments on a student bench.

OEM Manufacturer

Jain Scientific Equipments Private Limited, which sells under the ScienceLab name, is the OEM of this one way key and produces it at the company's own licensed factory at Saha, Ambala, Haryana, India. Plug keys are usually ordered in bench quantities, and buying factory-direct keeps supply and repeat orders straightforward; spare plugs can be requested straight from the manufacturer. The company profile explains more.

Related Physics Lab Equipment

Switching a simple cell circuit calls for a few companion items:

• Two Way Key — for switching a common point between two circuits.
• Contact Key (Push Switch) — a momentary alternative that closes only while pressed.
• Leclanche Cell — a cell to power the circuit being switched.
• Banana Plug Connectors Leads — 4 mm leads for the key's terminals.

Find other circuit accessories in the Physics Lab category.

Frequently Asked Questions

What does the One Way Key include?
The One Way Key has two brass blocks, each fitted with a 4 mm bakelite terminal and mounted on a moulded plastic base, plus one accurately tapered brass plug with a fluted plastic top that fits the hole between the blocks.

How does the One Way Key make good electrical contact?
The tapered brass plug of the One Way Key wedges firmly into the matching hole between the two brass blocks, giving negligible contact resistance. A slight twist while inserting it keeps the contact reliable throughout a practical session.

When should a one way key be used instead of a two way key?
Use the One Way Key when a single circuit needs to be switched on and off, such as a cell and resistance loop. A two way key is chosen when one common point must be connected to either of two circuits, as when comparing two cells.

Who manufactures the One Way Key?
The One Way Key is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Schools and dealers buying keys in bench quantities deal directly with the manufacturer.

Which leads fit the One Way Key terminals?
The 4 mm terminals on the One Way Key accept standard 4 mm banana-plug leads, the same connector used on many laboratory meters and resistance boxes. This lets students connect the key into circuits quickly without loose wire joints.

Can the One Way Key be supplied in bulk?
Yes, the One Way Key can be supplied in bulk for school, college and dealer orders in India and international markets. Tell us the quantity and delivery location through the contact page, and the manufacturer will prepare a quotation.

Request a Quote

Order the One Way Key by sending your quantity through the contact page or adding it to the enquiry cart. Quotations come directly from the factory.

Last updated: 24 September 2026

Two Way Key (Product Code: SCL-355/076) is a double plug key used to connect a common point to either of two circuits in school and college physics practicals. It is supplied with two accurately tapered brass plugs with fluted plastic tops, which seat between brass blocks fitted with 4 mm terminals on a moulded plastic base. It is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.

Specifications

What Is the Two Way Key Used For?

In a potentiometer experiment to compare the emfs of two cells, the two way key lets students switch the galvanometer branch from one cell to the other without rewiring: one plug brings the first cell into circuit, and moving to the other plug brings in the second. The same switching is used when comparing resistances or choosing between two branches of a circuit.

Insert only one plug at a time unless the experiment specifically needs both paths closed. Keep the tapered plugs and holes free of dust and tarnish, and store the plugs with the key so they are not lost between classes. It is standard physics practical equipment for potentiometer and bridge set-ups.

What to Specify When Ordering

• Quantity per laboratory or per potentiometer set.
• Whether One Way Keys are also required for the same benches.
• Any spare plugs to keep in the laboratory store.

OEM Manufacturer

This two way key is an OEM product of Jain Scientific Equipments Private Limited, the company that trades as ScienceLab, and it is manufactured at the company's own licensed factory at Saha, Ambala, Haryana, India. Laboratories, dealers and importers can buy it factory-direct alongside the rest of the electricity range, and requests for replacement plugs go straight to the maker. See the company profile for details.

Related Physics Lab Equipment

The two way key is most often used in emf-comparison circuits. Related items for that experiment:

• One Way Key — switches the driver circuit on and off.
• Potentiometer, 10 wire — the instrument on which the two cells are balanced.
• Deniel Cell — one of the cells whose emf is compared.
• Connecting Wire — for wiring the key into the circuit.

See the full Physics Lab category for more apparatus.

Frequently Asked Questions

How many plugs come with the Two Way Key?
The Two Way Key comes with two accurately tapered brass plugs, each with a fluted plastic top. Each plug closes one of the two paths, so the common terminal can be connected to either circuit as the experiment requires.

What is a two way key used for in a potentiometer experiment?
In emf comparison with a potentiometer, the Two Way Key connects the galvanometer and jockey branch to one cell or the other. Students balance each cell in turn simply by moving the plug, without disturbing any other connections.

How does the Two Way Key keep contact resistance low?
The Two Way Key uses accurately tapered brass plugs that fit snugly into holes between brass blocks, giving negligible contact resistance. Clean, dry plugs and a gentle twist when inserting them help maintain that low resistance from one practical to the next.

Who manufactures the Two Way Key?
Jain Scientific Equipments Pvt Ltd (ScienceLab) is the OEM of the Two Way Key and makes it at its own licensed factory in Saha, Ambala, Haryana, India. Orders, quotations and replacement plug requests are all handled by the manufacturer directly.

Which leads fit the Two Way Key?
The Two Way Key has 4 mm bakelite terminals on its brass blocks, so standard 4 mm banana-plug leads fit directly. This makes it easy to connect to potentiometers, galvanometers and cells that use the same 4 mm connections.

What is needed for a Two Way Key quotation?
For a Two Way Key quotation, send the quantity, any One Way Keys or potentiometer accessories you need, and the delivery location in India or abroad through the contact page. The manufacturer will reply with a quotation for the complete requirement.

Request a Quote

To buy the Two Way Key, write to us via the contact page or use the enquiry cart. You will be quoted by the manufacturer.

Last updated: 24 September 2026