Bar and Gauge Apparatus (Aluminium) Manufacturer,Supplier and Exporter in India
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Product Code : EL-SLE-4803
Jlab Export is a leading Bar and Gauge Apparatus (Aluminium) Manufacturer,and suppliers in India
Bar and Gauge Apparatus (Aluminium) (code EL-SLE-4803) is a classroom set for demonstrating the expansion and contraction of metals: a 100 x 10 mm aluminium bar and a U-shaped, brass-plated metal gauge, each mounted on its own insulated handle so students can heat and test the bar safely in school physics lessons. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Purpose | Demonstrating the expansion and contraction of metals |
| Bar | Aluminium, 100 x 10 mm (as listed) |
| Gauge | U-shaped metal gauge, brass plated |
| Handles | Bar and gauge each mounted on a separate insulated handle |
| Quality check | Each set is visually inspected before dispatch |
| Pack quantity | Each set (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-4803 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Bar and Gauge Sets?
| Model | Bar | Gauge | Handles and other listed details |
|---|---|---|---|
| This set (EL-SLE-4803) | Aluminium, 100 x 10 mm | U-shaped metal gauge, brass plated | Separate insulated handles |
| Bar and Gauge Physics | Mild steel, 110 mm long x 12.5 mm diameter | Brass, 150 x 38 mm, with a cut-out that just admits the bar lengthways and a hole the bar passes through endways when cold | Bar on a rod with a wooden handle; gauge on a separate wooden handle; listed for linear and spherical expansion |
| Bar and Gauge | Mild steel, 110 x 10 mm | Cast metal gauge, sliding fit over the ends of the bar, with a 10 mm bore hole in one arm | Bar on a rod with a wooden handle; overall length approx. 280 mm |
Choose the aluminium set when you want a bar of a lighter metal that expands more than steel for the same temperature rise, with both parts on insulated handles. The two mild-steel sets are listed with wooden handles, and their gauges also have a hole that tests the bar endways as well as lengthways.
What Is the Bar and Gauge Apparatus Used For?
At room temperature the bar just slides into the gap of the gauge. After the bar has been heated in a Bunsen flame it no longer fits, because the metal has expanded; as it cools it contracts and slides in again. This simple test makes the expansion of solids visible to a whole class and leads into everyday examples — the gaps left between railway rails, overhead wires that sag in summer, and a tight metal lid that loosens under hot water. It suits middle-school science lessons on heat and the thermal properties of matter in class 11 physics, and pairs naturally with a ball and ring demonstration.
Hold both parts only by their insulated handles, heat the bar evenly rather than at one point, and rest it on a heat-resistant mat while it cools. Keep the bar ends and the inside of the gauge clean and free of dents so the cold fit stays reliable from lesson to lesson.
What to Specify When Ordering
- Bar metal — this aluminium set, or one of the mild-steel bar and gauge sets compared above.
- Quantity — the minimum order is 10 sets; plan enough for each bench group to test its own bar.
- Heating equipment — add Bunsen burners and heat-resistant mats to the same enquiry if the lab needs them.
Frequently Asked Questions
What does the bar and gauge apparatus demonstrate?
It shows that a metal expands when heated and contracts when cooled. The cold bar fits the gauge, the hot bar does not, and it fits again once it has cooled.
What size is the bar?
The aluminium bar is listed as 100 x 10 mm. It is mounted on its own insulated handle, separate from the gauge.
Why is the bar made of aluminium?
Aluminium expands more than steel or brass for the same rise in temperature, so the change in fit appears after modest heating. It is also a lighter metal for students to handle.
Are the handles insulated?
Yes. Both the bar and the U-shaped gauge are mounted on separate insulated handles, so they can be held while the bar is heated and tested.
How does it differ from JLab’s mild-steel bar and gauge sets?
Those sets use a 110 mm mild-steel bar on a wooden handle, and their gauges include a hole for testing the bar endways. This set uses an aluminium bar with a brass-plated U-shaped gauge and insulated handles.
What information is needed for an export quotation?
Send the quantity, the destination country and port or city, your preferred delivery terms such as FOB or CIF, any packing or labelling instructions, and the tender reference if the purchase is for a tender.
Who manufactures this apparatus?
Jain Laboratory Instruments Pvt Ltd, trading as JLab, makes it at its works in Ambala, Haryana, India, and supplies it factory-direct.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a school science and physics equipment manufacturer in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. Its bar and gauge sets are made in JLab’s own works, not bought from a trader, so schools, colleges, dealers and importers can buy directly from the source; each set is visually inspected before dispatch and repeat orders are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — for example Costa Rica in Central America and the Caribbean, Peru in South America, Senegal in West Africa, Algeria in North Africa and Spain in Southern Europe. Tender details are on the JLab lab tenders page.
Thermal Expansion Demonstrations
- Bar and Gauge Physics — a mild-steel bar and brass gauge set on wooden handles.
- Bar and Gauge — a mild-steel bar with a cast metal gauge that slides over its ends.
- Ball and Ring Apparatus — a brass ball and ring that show the same effect in three dimensions.
- Bar Breaking Apparatus — shows the force exerted when a heated bar contracts.
- Bunsen Burner with a Spare Jet — a brass-pipe gas burner for heating the bar.
See the full 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 number of sets (minimum 10 units), any burners or other heat apparatus you need, and your delivery location through the contact page.
Last updated: 4 October 2026
