Scientific Instrument Manufacturer, Suppliers and Exporter in India
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Last updated: 22 October 2026
Quick Answer
Scientific Instrument is the electrical and electronics measurement range for college physics and engineering practicals: Wheatstone, Kelvin and AC bridges, resistance, condenser and inductance boxes, slide-wire and Crompton potentiometers, rheostats and variacs, panel and portable meters, and set-ups for the Hall effect, four-probe resistivity and device characteristics. JLab shows 76 items directly on this page, and its subcategories add trainers, test instruments and power supplies.
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Explore the Scientific Instrument Range
| Range | Items | What it covers |
|---|---|---|
| Resistance Bridges and Accessories | 12 | Portable Wheatstone bridges from 0.001 ohm to 11.1 megohm, one with Murray and Varley loop tests, Kelvin double bridges down to 2 micro-ohm, a Callender and Griffiths bridge, a 2 V meter bridge supply, and a dip cell, coil, boiler, bath and thermocouple. |
| AC Bridges, Oscillators and Detectors | 13 | Anderson, Maxwell, Owen, Hay, Schering and Wien bridges for inductance, capacitance and frequency, most with a built-in 1 kHz sine source and digital null detector, a self inductance bridge, a bridge oscillator, a null detector, a 1 Hz to 250 kHz A.F. oscillator and headphones. |
| Resistance, Capacitance and Inductance Boxes | 12 | Decade, dial and substitution resistance boxes, P.O. boxes and ratio arms in constantan or manganin, a high meg box up to 11111 megohms, fixed and four-dial condenser boxes from 0.001 mfd, and air-cored fixed and dial inductance boxes. |
| Potentiometers and Standard Cells | 10 | Slide-wire potentiometers with one or four wires and pencil or spring press jockeys, a dial-pattern and a Crompton potentiometer, a volt ratio box up to 750 V, a standard cell, a voltmeter and ammeter calibration set, and a spare jockey and lead. |
| Rheostats, Variacs and Loads | 7 | Single-tube, grooved and higher range rheostats, a 3 W wire-wound potential divider, single and three phase variacs giving 0-240 V or 0-270 V, a single phase rheostat bank and a 4 kW or 6 kW lamp load. |
| Meters, Oscilloscope and Current Sources | 11 | 3.5-digit digital panel meters, external shunts with 50 mV or 75 mV drop, power factor, frequency and demonstration meters, a cell tester, a wood moisture meter, a 10 MHz single beam oscilloscope, and DC current and voltage sources, one for the Millikan oil drop apparatus. |
| Physics and Electronics Experiment Set-ups | 11 | Apparatus for the Hall effect, magnetic susceptibility, four-probe resistivity and band gap, thermistor, UJT and MOSFET characteristics, LCR resonance, a BCD counter with IC 7490, frequency modulation, self and mutual inductance coils and an electrical vibrator. |
Scientific Instrument Specifications
The tables give a few items from each group with the ranges, dials, accuracy, supplies or test parts stated on each item's own page.
Resistance Bridges and Accessories (12)
| Product | Specification |
|---|---|
| Portable Wheatstone Bridge | Range of measurement: 0.001 ohm to 11.1 megohm; Measuring arm: 4 decades: 10 × 1, 10 × 10, 10 × 100 and 10 × 1000 ohms; Battery: Built-in 4.5 V dry battery; provision for an external battery when measuring high resistances. |
| Portable Wheatstone Bridge with Loop Test | Functions: Resistance measurement; Murray loop test; Varley loop test; conductance tests; Additional factors for Murray loop: 3: 10M, 100M and 1000M. |
| Industrial Double Bridge | Range of measurement: 2 micro-ohm to 11 ohm; Maximum current: 10 A intermittently; 5 A continuously; Multiplying ratios: 5 ratios (x100, x10, x1, x0.1 and x0.01) from a single rotary switch. |
| Double Portable Bridge | Instrument type: Portable Kelvin (double) bridge; Measuring range: 0.00001 ohm to 110 ohm. |
| Callender & Griffith Bridge | Functions: Three in one: Callender and Griffiths bridge, Carey Foster bridge and potentiometer; Slide wire: 50 cm long, 1 ohm resistance, calibrated into 100 equal parts. |
| Temperature Co-efficient Resistance Coil | Coil: Fine enamelled copper wire, about 7–10 ohms resistance, wound on an insulating frame; Tube size: Approx. 100 mm × 25 mm diameter. |
| Steam Boiler Element | Type: Steam boiler fitted with a heating element; Capacity: 2 to 3 litres. |
| Conductivity attachment | Distance between potential points: 50 cm; Specimen size: Any size from ½-inch diameter rod to 42 SWG wire. |
AC Bridges, Oscillators and Detectors (13)
| Product | Specification |
|---|---|
| Maxwell Inductance Bridge | Measures: Unknown inductance (Maxwell bridge); AC source: Built-in sine-wave signal of 1 kHz; two sockets for the AC output; Detector: Built-in null detector with digital display. |
| Schering Bridge | Measures: Unknown capacitance (Schering bridge method); Case: Teak wood, with all parts built in. |
| Owen Bridge | Measures: Unknown inductance (Owen’s bridge); R3: Decade dials: x10, x100 and x1000 ohm. |
| Hay Bridge | Measures: Unknown inductance (Hay bridge); R2 and R3: Three decade dials each: x10, x100 and x1000 ohm. |
| Wien Series Resistance Bridge | Measures: Unknown capacitance (Wien bridge method); Unknowns: Five unknown values on the panel, selected by a rotary switch. |
| Frequency Wien Bridge | Purpose: Finding the unknown frequency of a bridge oscillator; C1 and C2: Decade dials of 0.1 µF (mfd). |
| Bridge Oscillator | Frequency: Fixed, 1 kHz; Output: 0–10 V RMS, continuously variable. |
| A.F. Oscillator Bridge Experiments | Frequency range: 1 Hz to 250 kHz, in 6 steps; Waveforms: Sine, square and triangular; Output impedance: 50 ohms. |
Resistance, Capacitance and Inductance Boxes (12)
| Product | Specification |
|---|---|
| High Meg Resistance Box | Dials: 4; Range: 1 Meg to 11111 Meg ohms (1 MΩ to 11111 MΩ); Accuracy: ±1%. |
| Resistance Substitution Box | Resistors: 12 radio-type resistances in standard preferred values; Range: 100 ohms to 470 kilo-ohms; Selection: Rotary switch. |
| Resistance Box Constantan & Manganin | Switches: Eleven-position switches, designed for low contact resistance; Contact resistance: Of the order of 0.0015 ohm per decade; Panel and case: Insulating Bakelite panel in a polished teak wood box. |
| Economical Resistance Box Dial Type | Construction: Metal film elements in place of traditional wire-wound coils; Versions: Two-dial, three-dial and four-dial. |
| P.O. Box Ratio Constantan Coil | Coil wire: Constantan; Coil accuracy: Within ±0.1%; Blocks: Rectangular brass blocks, 14 mm thick. |
| Four Dial Condenser Box | Dial ranges: 10 x 0.001 mfd, 10 x 0.01 mfd, 10 x 0.1 mfd and 10 x 1 mfd; Smallest step: 0.001 mfd (1 nF). |
| Fixed Condenser Boxes | Values 5 to 40 mfd: Electrolytic capacitors; working voltage 350 V; Terminals: Two 4 mm socket terminals. |
| Fixed Inductance Boxes | Coils: Air-cored inductance coils; Accuracy: ±2.5%. |
Potentiometers and Standard Cells (10)
| Product | Specification |
|---|---|
| Potentiometer with Pencil Jockey | Wires: Four constantan wires, 24 SWG, each one metre long; Scales: Wires stretched along two full metre scales; Base: 18 mm thick ply wooden board with mica on top. |
| Potentiometer Single wire | Wire: One constantan wire, 0.56 mm diameter (about 24 SWG); Supplied with: Pencil jockey and lead. |
| Potentiometer Dial Pattern | Slide wire: Linear, 50 cm long, subdivided into 500 equal parts (1 mm per division); Jockey: Thick knife-edge jockey for making contact on the slide wire. |
| Crompton Potentiometer | Working current: Of the order of 125 mA; Slide-wire division: 1/2 mV (500 microvolts) per division; Current adjustment: Coarse and fine rheostats. |
| Volt Ratio Box | Purpose: Extends the range of the Crompton potentiometer; Ranges, 750 V model: 1.5, 15, 30, 150, 300 and 750 V; Resistance, 750 V model: 37,500 ohms. |
| Standard Cell | Function: Standard, stable voltage reference source; Temperature range: Accurate between 10 °C and 40 °C; Housing: Small steel cabinet. |
| Calibration of Voltmeter & Ammeter | Purpose: Standardisation of a DC potentiometer; calibration of a voltmeter and an ammeter using a DC potentiometer; Standard cell: Built in; Power supplies: Built in, 0–12 V DC / 1 A. |
| Potentiometer with Spring Type Press Jockey | Jockey: Spring-type brass sliding press jockey, replacing the usual pencil jockey; Jockey body and movement: Moulded from brass alloy; slides over a metal rod for smooth movement. |
Rheostats, Variacs and Loads (7)
| Product | Specification |
|---|---|
| Rheostat Single Tube | Tube: Vitreous enamelled steel; Winding: Heavily oxidised resistance wire, locked in place with ceramic cement; End stands: Robust enamelled die-cast end stands. |
| Groove Type Rheostat Tube | Former: Thick-wall porcelain or cement pipe with a deeply grooved outer surface; Cooling: Grooves provide air ducts for convection cooling. |
| Higher Range Rheostat | Resistance wire: Kanthal wire, with high stability and strength (used in place of bare Eureka wire); Slider: Moves the full length of the rheostat, quickly and easily. |
| Potentiometer Wire | Element: Wire-wound potentiometer, 3 W; Connections: Three 4 mm sockets on top for a potential-dividing arrangement. |
| Variac Single & Three Phase | Versions: Single phase and three phase; Output voltage: 0–240 V (line-voltage connection); 0–270 V (over-voltage connection). |
| Rheostat Bank Single Phase | Supply rating: 250 V AC, 50 Hz (single phase); Winding wire: Nickel-copper or nickel-chrome. |
| Lamp Load Single Phase | Loading capacity: 4 kW or 6 kW (two versions); Load steps: 200 W each. |
Meters, Oscilloscope and Current Sources (11)
| Product | Specification |
|---|---|
| Digital Panel Meters | Display: 3.5-digit LED; DC voltage ranges: ±199.9 mV, ±1.999 V, ±19.99 V, ±199.9 V, ±1000 V. |
| External Shunts with 50 mV or 75 mV Drop | Voltage drop: 50 mV or 75 mV; Current ratings: 1 A to 50 A; 75 A, 100 A, 150 A, 200 A, 250 A, 300 A, 500 A, 1000 A, 1500 A, 2000 A. |
| Power Factor Meter | Elements: 3; Rated voltage: 440 V; Accuracy: ±1.5%. |
| Frequency Meter | Frequency range: 30–100 Hz; Dial: 110 mm scale; Accuracy: ±1%. |
| Oscilloscope | Type: Single beam; fully solid state; Vertical bandwidth: DC to 10 MHz (3 dB); Input impedance: 1 MΩ. |
| Adjustable D.C. Current Source | Output voltage: Approximately 0–10 V DC; Current meter: Ammeter, 0–10 A; Output terminals: Two heavy brass terminals. |
| Moisture Meter For Wood | Range: 8–32% moisture; Sensor: 2-pin probe; Dimensions: 27 x 14 x 13 cm. |
| Demonstration Joint Meter | Case: Teak wood, glassed, visible from both sides; Scale: Scaled on both sides; scale length 180 mm. |
Physics and Electronics Experiment Set-ups (11)
| Product | Specification |
|---|---|
| Hall Effect Experiment | Electromagnet: 7.5 kG (0.75 T); Crystal current supply: Constant current, 0–20 mA; Gauss meter: Digital, 0–20 kG (0–2 T), with Hall probe. |
| Resistivity of Semiconductors by Four Probe Method at Different Temperatures and Determination of Band-Gap | Sample: Germanium (Ge) crystal, mounted; Oven: Heats up to 200 ºC; Thermometer: 0–200 ºC. |
| Susceptibility of FeCl3 Solution | Electromagnet: 7.5 kG (0.75 T) strength; Sample tube: Graduated capillary tube with stand. |
| UJT Characteristics Apparatus | Device under test: One UJT, type 2N2646, mounted on the panel; Meters: Three round meters for voltage and current measurement. |
| Mosfet Characteristics Apparatus | Power supplies: Two DC supplies: 0–10 V DC, 10 mA and 0–5 V DC; Dimensions: 11 x 8 x 4 inches. |
| LCR Resonance Apparatus Series and Parallel | Components: 1 resistance, 1 capacitor and 1 inductance, with connections brought out to terminals; Meters: 2 AC moving coil meters, for voltage and current; Dimensions: 10 x 8 x 3 inches. |
| Study of 4 Bit BCD Counter and Decimal to Binary Encoder using IC 7490 | Counter IC: IC 7490; Clock: 1 Hz clock pulse; Outputs: Four output indicators. |
| Study of Frequency Modulation and Demodulation | Measurements: Frequency modulation index; upper and lower sideband frequencies; frequency of the demodulated signal; Oscillator: Square wave oscillator, 1 kHz output. |
Related Equipment in Other JLab Ranges
Further instruments and trainers sit in the subcategories of Scientific Instrument, for example these items from six of them.
Who Buys This Range
Physics laboratories in degree colleges and universities that run meter bridge, potentiometer, Carey Foster and AC bridge practicals, electrical engineering laboratories measuring low resistance, inductance, capacitance and power factor, and advanced physics laboratories doing Hall effect, susceptibility and four-probe band gap experiments.
Frequently Asked Questions
Which bridges in this range measure inductance?
The Self Inductance Anderson Bridge, Maxwell Inductance Bridge, Owen Bridge and Hay Bridge each measure an unknown inductance, and the Maxwell Inductance Capacitance Bridge measures inductance in terms of a standard capacitance. The Anderson, Maxwell, Owen and Hay bridges are built into teak wood cases with a built-in 1 kHz sine-wave signal, a digital null detector and 4 mm sockets.
What is the range of the Portable Wheatstone Bridge?
It measures from 0.001 ohm to 11.1 megohm, with a 4-decade measuring arm of 10 x 1, 10 x 10, 10 x 100 and 10 x 1000 ohms, 7 range multipliers on a single rotary switch, a built-in galvanometer and a built-in 4.5 V dry battery.
What does the Hall Effect Experiment include?
It has a 7.5 kG (0.75 T) electromagnet with a 0-100 V, 4 A power supply, a mounted germanium crystal with a 0-20 mA constant current supply, two digital meters for Hall voltage and crystal current, and a digital gauss meter of 0-20 kG with a Hall probe.
Request a Quote
Name the bridges, boxes or potentiometers you need with quantities, for example the Portable Wheatstone Bridge or the Crompton Potentiometer, and send the list through the contact page.
LCR Resonance Apparatus Series and Parallel
Product Code : EL-SI-1109
Apparatus to plot current against frequency for series and parallel LCR circuits, with R, L and C brought out to terminals, two AC meters and an audio frequency function generator.
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Study of 4 Bit BCD Counter and Decimal to Binary Encoder using IC 7490
Product Code : EL-SI-1174
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Digital Panel Meters
Product Code : EL-SI-1228
3.5 digit LED digital panel meters, mains operated, each for one parameter: DC or AC voltage (199.9 mV to 1000 V ranges) or DC or AC current (1.999 mA to 19.99 A ranges).
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External Shunts with 50 mV or 75 mV Drop
Product Code : EL-SI-1230
Range 1 to 50 Amp., 75 Amps., 100 Amps, 150 Amps, 200 Amps, 250 Amps., 300 Amps, 500 Amps, 1000 Amps, 1500 Amps, 2000 Amps.
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Power Factor Meter
Product Code : EL-SI-1231
Electro-dynamic power factor meter with 3 elements, rated 440 V, 50 Hz; 6 inch scale, round flush mounting type.
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