Meter Bridge and Pencil Jockey Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-4645
Jlab Export is a leading Meter Bridge and Pencil Jockey Manufacturer,and suppliers in India
Meter Bridge and Pencil Jockey (code EL-SLE-4645) is a four-gap metre bridge with heavy copper strips, nine heavy brass lock-type terminals and a 24 SWG constantan wire stretched along a wooden metre scale, supplied with a pencil jockey, a connecting lead and a working manual. It is used for resistance experiments in school and college physics, including finding an unknown resistance. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Type | Four-gap metre bridge |
| Conducting strips | Large, heavy copper strips |
| Terminals | Nine heavy brass terminals, lock type, to keep contact resistance to a minimum |
| End gaps | Closed by removable copper binding pieces held in place by the terminals |
| Bridge wire | 24 SWG constantan wire (about 0.56 mm diameter) stretched along the top of a wooden metre scale |
| Wire clamping | Securely clamped to the brass end strips so that end errors are negligible |
| Base | Heavy laminated base, 3/4 inch (about 19 mm) thick; listed as 45 x 4 x 3/4 inch |
| Overall dimensions | 1.12 m x 100 mm x 50 mm including terminals (as listed — confirm if bench space is tight) |
| Supplied with | Pencil jockey, lead for connections and a detailed working manual |
| Quality check | Each bridge is visually inspected before dispatch |
| Pack quantity | Each (one bridge with its jockey, lead and manual) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-4645 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Meter Bridges?
| Model | Construction | Listed details |
|---|---|---|
| This bridge (EL-SLE-4645) | Four-gap; copper strips; laminated base | Nine brass lock-type terminals; 24 SWG constantan wire on a wooden metre scale; 1.12 m long; jockey, lead and manual |
| Wheatstone Bridge with pencil Jockey | Four-gap; copper strips; laminated base | Listed with the same terminals, binding pieces and 24 SWG constantan wire |
| Meter Bridge (brass strip) | Four-gap; brass strip; laminated base | 1.10 m x 100 mm x 50 mm; pencil jockey and lead |
| Meter Bridge (aluminium extrusion) | Single 1 m wire on a powder-coated aluminium extrusion | 24 SWG bare constantan wire on a metre rule in cm and mm; 4 mm socket terminals; jockey |
Choose this bridge when you want the four-gap layout with copper strips and a manual for students, as used in the standard practicals. The brass-strip bridge is a slightly shorter four-gap model, and the aluminium-extrusion bridge suits labs that prefer 4 mm sockets on a metal frame.
What Is a Meter Bridge Used For?
A metre bridge is a Wheatstone bridge in which two of the four arms are the two parts of a uniform wire one metre long. An unknown resistance X goes in one gap and a known resistance R from a resistance box in the other; a cell and key are connected across the ends of the wire, and a galvanometer between the centre terminal and the jockey. Touching the jockey along the wire, students find the balance point where the galvanometer shows no deflection. At balance X/R = l/(100 − l), where l is the balancing length in centimetres. The class 12 practicals use it to find the resistance of a given wire and then the resistivity of its material, and to verify the laws for resistances in series and in parallel.
Constantan is used for the bridge wire because its resistance changes very little with temperature. For accurate results choose R so that the balance point falls near the middle of the wire, take readings with X and R interchanged and average them, and keep the current on only while taking a reading. Press the pencil jockey gently and lift it before moving it — dragging it along the wire scrapes the wire and spoils its uniformity.
What to Specify When Ordering
- Quantity — the minimum order is 10 bridges; one per practical group is usual.
- Bench set — add a galvanometer, plug-type resistance box, plug key, cell or power supply, and resistance wire so each station is complete.
- Spares — extra pencil jockeys and constantan wire for re-wiring.
Frequently Asked Questions
What is included with the meter bridge?
The four-gap bridge with its 24 SWG constantan wire and wooden metre scale, a pencil jockey, a lead for connections and a detailed working manual.
Are the galvanometer and resistance box included?
No. They are separate items, linked below, and can be quoted in the same enquiry so the practical set is complete.
Why does the bridge have four gaps?
The extra gaps let resistances be placed in more than one position on the bridge; the end gaps are closed by removable copper binding pieces when they are not in use, held in place by the terminals.
How are end errors handled?
The constantan wire is clamped securely to the brass end strips so that end errors are negligible. Interchanging the two resistances and averaging the readings also cancels most of any remaining end effect.
What are the dimensions?
The overall size is listed as 1.12 m x 100 mm x 50 mm including terminals, on a heavy laminated base 3/4 inch thick. Confirm the exact size with JLab if your bench space is limited.
What should an export quotation request include?
The quantity, the accessories you need with each bridge, the destination country and port or city, the delivery terms (for example FOB or CIF), any packing or labelling needs and the tender reference if there is one.
Who manufactures this meter bridge?
Jain Laboratory Instruments Pvt Ltd (JLab) builds it at its works in Ambala, Haryana, India, and quotes for it directly as the manufacturer.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a physics lab instruments manufacturer in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The meter bridge is assembled and wired at JLab’s own works rather than bought from a trader, so schools, colleges, dealers and importers buy it factory-direct; each bridge is inspected before dispatch, and spare jockeys, re-wiring and repeat orders are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — for example Sri Lanka in South Asia, Hong Kong in East Asia, Barbados in Central America and the Caribbean, Serbia in Southern Europe and Canada in North America. For institutional tenders, see the JLab lab tenders page.
Complete the Meter Bridge Practical
- Galvanometer — detects the small current that disappears at the balance point.
- Resistance Box Plug Type (Superior Type) — supplies the known resistance R.
- Pencil Jockey — a spare sliding contact with an insulated handle.
- Constantan Wire — nickel–copper alloy wire with a low temperature coefficient, for test coils or re-wiring.
- Plug Key — for switching the cell circuit on only while a reading is taken.
More apparatus is in the School Lab Equipment range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), the accessories you want with each bridge, and your delivery location through the contact page.
Last updated: 4 October 2026
