Proof Plane Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-4691
Jlab Export is a leading Proof Plane Manufacturer,and suppliers in India
Proof Plane (code EL-SLE-4691) is an electrostatics accessory used to transfer electric charge from one object to another, for example from a charged conductor to an electroscope, in school and college physics labs. It is a plated brass disc mounted on a metal shaft with a 6 mm insulated handle, so the charge stays on the disc rather than leaking away through the hand. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Head | Plated brass disc |
| Shaft | Metal shaft carrying the disc |
| Handle | Insulated, 6 mm (as listed) |
| Function | Transfers electric charge from one object to another |
| Quality check | Each proof plane 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-SLE-4691 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with the JLab Van de Graaff Proof Plane?
| Model | Head | Listed size and other details |
|---|---|---|
| This proof plane (EL-SLE-4691) | Plated brass disc on a metal shaft | 6 mm insulated handle; other sizes not stated |
| Proof Plane Van de Graaff JLab | Sphere | Sphere 3.5 cm; length 18 cm; for transferring charge from one body to another |
Choose the flat-disc proof plane when students need to lay the head against a surface and compare the charge at different points; the spherical proof plane is listed for Van de Graaff work.
What Is a Proof Plane Used For?
When the disc of a proof plane is laid flat against a charged conductor, it becomes part of that surface for a moment and takes up a share of the charge in proportion to the local surface charge density. Lifted away by its insulated handle and touched to the cap of an electroscope, it shows how much charge that spot carried. In this way students can show that charge collects more strongly at the pointed end of a conductor than on its flat sides, that charge on a hollow conductor sits on the outer surface rather than inside, and whether a body is charged at all. These demonstrations support the topic of electric charges and conductors in class 12 physics and first-year college electrostatics.
Hold the proof plane only by the end of its insulated handle, and keep the handle clean and dry, because dirt and moisture let charge leak away. Touch the disc to an earthed metal object between samples so that each reading starts from zero, and work in dry air whenever possible.
What to Specify When Ordering
- Quantity — the minimum order is 10 units; one per electroscope set is a practical plan.
- Head type — this flat brass-disc model, or the spherical Van de Graaff proof plane.
- Matching apparatus — gold leaf electroscopes, electrophorus sets and charging rods are separate items for the same enquiry.
Frequently Asked Questions
What is a proof plane used for?
It carries a small sample of electric charge from one object to another, typically from a charged conductor to an electroscope, so that the charge at different places can be compared.
What is this proof plane made of?
It is a plated brass disc mounted on a metal shaft, with an insulated handle listed as 6 mm. The disc diameter and overall length are not stated, so ask JLab to confirm them.
Why does the handle have to be insulated?
If the handle conducted, the charge picked up by the disc would flow through the student’s hand to earth and nothing would reach the electroscope. The insulated handle keeps the charge on the disc.
Should I choose a disc or a spherical proof plane?
A flat disc can be laid against a surface to sample the charge at that point, which suits charge-distribution experiments. JLab also lists a spherical proof plane, 3.5 cm sphere and 18 cm long, for Van de Graaff work.
Who manufactures this proof plane?
Jain Laboratory Instruments Pvt Ltd, trading as JLab, makes 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 maker of electrostatics and general physics lab equipment in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The proof plane is produced at JLab’s own works and not sourced from a trader, so schools, colleges, dealers and importers buy it factory-direct, each piece 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 Afghanistan in South Asia, Cameroon in Central Africa, Argentina in South America, Armenia in Eastern Europe and Ethiopia in East Africa. Tender information is on the JLab lab tenders page.
Related Electrostatics Apparatus
- Gold Leaf Electroscope — detects the charge brought to it by the proof plane.
- Electrophorus Strip — a bakelite disc and insulated brass disc for producing small static charges.
- Van de Graaff Generator — a high-voltage source for a wide range of electrostatic experiments.
- Proof Plane Van de Graaff JLab — the spherical proof plane listed at 3.5 cm and 18 cm long.
- Polythene Rod — a rod charged by rubbing, to give the conductor its charge.
- Electrostatic Kit — an electroscope, proof plane, electrophorus plate and other parts in one kit.
See more apparatus 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), any electroscopes or charging rods to include, and your delivery location through the contact page.
Last updated: 4 October 2026
