Double Portable Bridge Manufacturer,Supplier and Exporter in India
Product Code : EL-SI-8052
Jlab Export is a leading Double Portable Bridge Manufacturer,and suppliers in India
Double Portable Bridge (code EL-SI-8052) is a portable Kelvin (double) bridge for measuring unknown resistances from 0.00001 ohm to 110 ohm in physics, electrical engineering and polytechnic labs. It combines a ratio dial, a ten-step main dial and a 100-step circular scale with a built-in galvanometer, and connects to the specimen through four terminals, C1, P1, C2 and P2. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Instrument type | Portable Kelvin (double) bridge |
| Measuring range | 0.00001 ohm to 110 ohm |
| Ratio dial | One ratio dial with multiplying values of 100, 10, 1 and 0.01 (as listed) |
| Main dial | Resistance dial of 1 ohm in 10 equal steps of 0.1 ohm |
| Circular scale | On the panel, in series with the main dial; 0.1 ohm in 100 equal steps of 0.001 ohm |
| Galvanometer | Built-in; terminals g1 and g2 for an external galvanometer, with a selector switch for built-in or external |
| Press key | Double-point press key on the panel to bring the galvanometer and battery into circuit |
| Specimen terminals | Four terminals: C1 and C2 (current), P1 and P2 (potential), for a four-terminal unknown resistance |
| Quality check | Each bridge is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SI-8052 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with the JLab Industrial Double Bridge?
| Model | Range | Balancing elements | Galvanometer and other listed details |
|---|---|---|---|
| This bridge (EL-SI-8052) | 0.00001 to 110 ohm | Ratio dial (100, 10, 1, 0.01); main dial of 10 x 0.1 ohm; circular scale of 100 x 0.001 ohm | Built-in galvanometer, with g1/g2 terminals and a selector for an external one |
| Industrial Double Bridge | 2 micro-ohm to 11 ohm | Five ratios (x100 to x0.01); 10 coils of 0.01 ohm plus a circular slide wire | External galvanometer and battery terminals; bakelite panel in a teak wood box; rated 10 A intermittently |
Choose this portable model when a self-contained bridge with its own galvanometer is convenient, for example on a teaching bench, and you want readings up to 110 ohm. The industrial model is listed for heavier test currents and a lower bottom range, which suits cable, winding and relay-contact measurements.
What Is the Double Portable Bridge Used For?
A Kelvin double bridge measures resistances that are too low for a Wheatstone bridge to handle accurately, because the resistance of leads and contacts would add to the result. The four-terminal connection solves this: current enters the specimen at C1 and C2, while P1 and P2 sense the potential across just the part being measured. Typical work includes the resistance of short wire samples, cable conductors, shunts and switch contacts, and the “Kelvin’s double bridge” experiment in BSc physics and engineering measurement labs.
In use, connect the current leads to C1 and C2 and the potential leads to P1 and P2, set the ratio dial, select the built-in galvanometer, and close the double-point press key. Adjust the main dial and then the circular scale until the galvanometer shows no deflection; the unknown resistance is the sum of the two dial readings multiplied by the ratio. For finer null detection, a more sensitive external galvanometer can be connected at g1 and g2 and chosen with the selector switch.
What to Specify When Ordering
- Quantity — the minimum order is 10 bridges, supplied individually.
- Galvanometer — the bridge has one built in; add an external galvanometer to the enquiry if you want more sensitivity.
- Specimen holder and current supply — list any conductivity attachment, leads or DC supply you need with the bridge.
Frequently Asked Questions
What resistance range does the Double Portable Bridge cover?
From 0.00001 ohm to 110 ohm. The main dial (1 ohm in 0.1 ohm steps) and the circular scale (0.1 ohm in 0.001 ohm steps) are multiplied by the ratio dial setting.
Does it have a built-in galvanometer?
Yes. An inbuilt galvanometer is fitted, and terminals g1 and g2 accept an external galvanometer; a selector switch chooses between them.
What are the C1, P1, C2 and P2 terminals for?
They connect a four-terminal unknown resistance. C1 and C2 carry the current and P1 and P2 sense the potential, which keeps lead and contact resistance out of the measurement.
How does it differ from the Industrial Double Bridge?
This model reads up to 110 ohm and has its own galvanometer. The industrial model reads from 2 micro-ohm to 11 ohm, uses an external galvanometer and is rated for heavier test currents; see the comparison table above.
What should an export quotation request include?
The quantity, the destination country and port or city, delivery terms such as FOB or CIF, packing or labelling requirements, and any tender reference.
Who manufactures it?
Jain Laboratory Instruments Pvt Ltd (JLab) builds the bridge at its works in Ambala, Haryana, India.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, an Indian manufacturer of physics and electrical lab instruments, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The bridge comes from JLab’s own works, not from a trading house, so universities, colleges, dealers and importers buy it direct; each instrument is visually inspected before dispatch, and repeat orders and spares are dealt with by the maker. The company is registered under CIN U29309HR2017PTC069123 and holds MSME Udyam registration UDYAM-HR-01-0003849 (manufacturing enterprise). JLab exports worldwide and ships to buyers in every region — Chad in Central Africa, Uzbekistan in Central Asia, Madagascar in East Africa, Finland in Northern Europe and Serbia in Southern Europe, to name a few. Tender details are on the JLab lab tenders page.
Accessories and Related Instruments
- Conductivity attachment — a specimen holder with current and potential terminals 50 cm apart for wires, rods and strips.
- Spot Reflecting Galvanometer — a DC null detector for bridges that can be connected at the g1 and g2 terminals.
- Adjustable D.C. Current Source — a mains-operated, continuously adjustable DC current source of up to 10 A.
- Industrial Double Bridge — the heavier-current double bridge compared above.
- Portable Wheatstone Bridge — for medium resistances, with a built-in galvanometer and dry battery.
The full range is in the Scientific Instrument category and the Indian Instruments section.
Request a Quote
JLab quotes for the bridge directly as its manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), any galvanometer, attachment or supply you need and your delivery location through the contact page.
Last updated: 8 October 2026
