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Two Way Key
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
| Parameter | Detail |
|---|---|
| Plugs | 2 accurately tapered brass plugs with fluted plastic tops |
| Blocks | Brass, each fitted with a 4 mm bakelite terminal |
| Base | Moulded plastic |
| Contact | Plugs fit the holes between the blocks for negligible contact resistance |
| Product code | SCL-355/076 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
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
