Steel wire close-wound helix 20mm diameter. 
Looped ends.
Closed length 3 metre extending to approx. 9 metre.

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Comprising a cylindrical rod composed of two halves, one end of which is metal, the other wood. 
Dimensions: 200 x 30mm (dia.)
If paper is wrapped tightly round the cylinder and the rod is briefly held above a Bunsen flame, the portion in contact with the wood will be quickly scorched while the portion in contact with the metal will remain uncharred.

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A light dependent resistor, fully covered resister of 10 ohms.
In normal room conditions resistance of 250 ohms approx.

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The stroboscope is also known as a revolution calibration meter as well as a stroboscopic lamp. 
It emits an instantaneous intense Xenon flash which can be synchronized with the speed of a target object.
This procedure permits calculation of the speed of an object that has an unknown movement speed or rotational velocity. 
It features a rotating encoder to facilitate rapid frequency modulation. 
It incorporates a high performance microcontroller as the processing unit and it includes a specific display chip which drives the 7-segment LED to present real-time flashing frequency data. 
In practice, the target object will appear to be moving slowly or stationary, however, in reality it is easily photographed using standard digital cameras. 
Used in a wide variety of scientific and industrial applications. 
Operation is simple and convenient with complete instructions supplied.

Technical Specifications :
Power supply: AC220V± 5%, 1.2A Power supply: AC220V± 5%, 1.2A
Power Consumption: Maximum power consumption less than 8W
Triggering Frequency Scope: 0.2~300 Hz (internal & external)
Recommended Triggering Frequency: 0.2~180 Hz
Flash tube intensity: approximately 10000 lux
External Triggering signal Scope: 5~12V pulse signal
Outside dimension (L x W x Ht): 215mm × 140mm × 150mm
Net Weight: 2 Kg

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Monocular Biological Microscope is a new generation microscope ideally designed for junior to middle science education. 
Brass gears and mechanical parts are used to ensure the microscope to last for many years in the education environment. 
The Microscope offers a superior optical system with high-quality glass optics.
The microscope also comes with many thoughtful and unique features that stand out.

Technical Specifications :
Head: Monocular, 45° inclined, 360° rotation
Eyepiece: WF10X/18mm with pointer
Nosepiece: Triple
Objectives: Achromatic, DIN 4X 10X 40Xs 
Condenser: Built-in condenser len N.A. 0.65
Filter: Built-in frosted glass
Stage: 110x105mm gliding stage with sample clips
Diaphragm: Disc diaphragm
Focusing System: Seperate Coarse and Fine Adjustment Coarse
Focus Precision: 2um
Focusing Stroke: 8mm
Illumination: LED Illumination with intensity control
Power: 110-220v or rechargeable batteries
Accessories included: Dust cover, charger, batteries, calibration slide

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This Monocular Mirror Microscope is designed with elementary school and hobby users in mind. 
Its large gripping area makes it an easy to handle microscope throughout the classroom and even outdoors. 
Its simplicity allows young and inexperienced users to be introduced to the fascinating world of microscopy. 
Although designed for more inexperienced users, the optics of the Monocular Mirror Microscope offers an excellent image. 

Technical Specifications :
Vertical monocular head which can be tilted to 45°
Spring Coarse focusing adjustment
88mm x 82mm stage with stage clips
Rotating disc diaphragm
Removable plano-concave mirror
Widefield eyepiece WF10X/14mm with built-in pointer
Revolving triple nosepiece with positive click stops
Parcentric and Parfocal objectives 4X/0.10, 10X/0.25, 40X/0.65

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Binocular Microscope With Achromatic 4/10/S40/S100x Oil Objectives, 1 W Cordless Illumination and X-Y Mechanical Stage.

Technical Specifications :
Wide field WF: 10x/18 mm eyepiece without pointer 30° inclined tubes 
Interpupillary distance is adjustable between 48 and 75 mm 
Head: rotatable 360° 
Revolving nosepiece with four achromatic 4/10/S40/S100x Oil Objectives on ball bearings 
Diopter: ± 5 diopter adjustment on left tube 
Coaxial coarse and fine adjustments, 200 graduations, 12.5 µm per graduation, 2.5 mm per rotation, total travel approximately 15 mm, with adjustable rack stop 
The S40x and S100x oil immersion objectives are spring loaded 
Plain mechanical 123 x 119 mm stage 70 x 27mm X-Y travel range with two non-removable object clamps 
Ergonomic stand 
All optics are anti-fungus treated and anti-reflection coated 
Height adjustable 
Abbe condenser N.A. 1.25 with iris diaphragm and filter holder, helicoidal adjustment 
1 W Cordless Illumination 
Rechargeable batteries 
External 100-240 Vac mains/charger adapter

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Binocular Microscope With Plan PL 4/10/S40/S100x Oil Objectives, Mechanical Rackless Stage And 3 W Illumination.

Technical Specifications :
150 x 140 mm stage with integrated rackless X-Y mechanical stage with 75 x 30 mm travel.
WF10x/20 mm eyepiece 30° inclined Ø 30 mm tubes.
The S40x and S100x objectives are spring loaded.
All optics are anti-fungus treated and anti-reflection coated.
Interpupillary distance is adjustable between 48 to 75 mm ±5 diopter adjustment on left tube 360° rotatable head secured with a screw Reversed quadruple nosepiece on ball bearings 4x/10x/S40x/S100x plan IOS objectives. 
Coaxial coarse and fine adjustments with 200 graduations, precision 1.5 μm per graduation, 0.3 mm per rotation, total travel approximately 28 mm.
Coarse adjustments are equipped with friction control Height adjustable.
Abbe condenser N.A. 1.25 with iris diaphragm and filter holder Height adjustable. 
Zernike phase contrast kit with IOS objectives and rotating phase contrast disc with four annuli, centering telescope and green filter. 
Adjustable 3 W illumination system.
Ergonomic carrying grip.
Supplied with an adjustable rack stop. 

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