Spherometer Disc Type Manufacturer,Supplier and Exporter in India
Product Code : EL-MI-2121
Jlab Export is a leading Spherometer Disc Type Manufacturer,and suppliers in India
Spherometer Disc Type (code EL-MI-2121) is a three-legged spherometer used to measure the radius of curvature of lenses and spherical mirrors in school and college physics labs. A fine-pitch screw through the centre of the frame forms the fourth leg, a millimetre main scale reads 10-0-10 mm, and the circular scale on the screw head has 100 divisions. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Frame | Small metal frame on three legs fixed at the corners of an equilateral triangle |
| Screw | Fine-pitch screw through the centre of the frame, forming the fourth leg |
| Main (pitch) scale | Marked in millimetres on a metal strip fixed at right angles to the frame; zero at the centre, 10-0-10 mm |
| Circular scale | On the screw head, divided into 100 equal parts (50 parts on some pieces) |
| Reading reference | The edge of the circular scale runs close to the metal strip, which serves as the reference line |
| Materials | Disc and scales brass, lacquered; legs steel, black painted |
| Quality check | Each spherometer 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-MI-2121 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Spherometers?
| Model | Body | Screw and legs | Scales (as listed) |
|---|---|---|---|
| This spherometer (EL-MI-2121) | Small metal frame; brass lacquered disc | Fine-pitch screw; black-painted steel legs | 10-0-10 mm main scale; 100 (or 50) circular divisions |
| Spherometer Double Disc | Circular metal table, 50 mm diameter | Steel screw in a long adjustable brass bearing; black-painted steel legs | Circular scale on the thread, scale on the table |
| Spherometer Double Disc (Stainless Steel) | Double disc | Stainless steel screw and legs | Not detailed on its page |
| Spherometer Laboratory | Brass dial head, 40 mm diameter | Stainless steel screw, 1 mm pitch; stainless steel legs | 10-0-10 vertical scale; 100 divisions reading to 0.01 mm |
| Spherometer Demonstration Model | Extra large; aluminium disc of about 6 cm | Not detailed on its page | Black-painted aluminium vertical scale |
Choose the disc type for routine student practicals where a brass-scaled spherometer with a centre-zero main scale is enough. The stainless steel models suit buyers who want a corrosion-resistant screw and legs, and the demonstration model is sized for showing the readings to a whole class.
What Is the Disc-Type Spherometer Used For?
The spherometer is the standard instrument for the CBSE and ICSE class 11 physics practical on finding the radius of curvature of a spherical surface, such as a convex lens or a concave mirror, and it is also used in college optics labs. The three outer legs define a plane; the centre screw is raised or lowered until its tip touches the surface, and the change in height (the sagitta) is read from the main scale and the circular scale. With the mean distance l between the legs and the sagitta h, the radius of curvature is R = l²/6h + h/2. One complete turn of the screw moves it by one pitch, so the least count is the pitch divided by the number of circular-scale divisions.
To take a reading, first set the spherometer on a flat glass plate and turn the screw until the tip just touches it; note the main-scale and circular-scale readings. Move it to the curved surface and repeat. For l, press the legs on a sheet of paper and measure the sides of the triangle they mark. Always approach the surface by turning the screw in one direction to avoid backlash, and wipe the lacquered brass parts dry after use.
What to Specify When Ordering
- Circular-scale divisions — 100 or 50 equal parts, as listed; ask for the pitch you need at the same time.
- Model — this disc type, a double-disc or stainless steel version, or the demonstration model for teacher use.
- Quantity — the minimum order is 10 spherometers; plan for each practical group plus spares.
- Accessories — flat glass plates, lenses and mirrors for the practical are separate items and can be added to the enquiry.
Frequently Asked Questions
What is the least count of this spherometer?
It is the screw pitch divided by the number of circular-scale divisions (100, or 50 on some pieces). The listing describes the screw as fine-pitch without giving the value, so confirm the pitch, and therefore the least count, when you ask for a quote.
What range does the main scale cover?
It is marked in millimetres with the zero at the centre, reading 10-0-10 mm, so the screw tip can be measured above or below the plane of the legs.
How does it differ from the Spherometer Double Disc?
The double-disc model has a 50 mm circular metal table with the screw running in a long adjustable brass bearing. This disc type uses a small metal frame with a scale strip fixed at right angles and a centre-zero 10-0-10 mm main scale.
Are a glass plate and lenses included?
No. This listing covers the spherometer only; the plane glass plate and the lenses or mirrors used in the practical are separate items.
What should an export enquiry include?
The quantity, the destination country and port or city, delivery terms such as FOB or CIF, any packing or labelling requirements, and a tender reference if there is one.
Who manufactures this spherometer?
JLab — Jain Laboratory Instruments Pvt Ltd — makes it at its Ambala works in Haryana, India, and quotes directly as the manufacturer.
OEM Manufacturer
Jain Laboratory Instruments Pvt Ltd, known as JLab, is a physics practical equipment manufacturer in India, incorporated in 2017, with its works on Hargolal Road, Ambala, Haryana. The spherometer is built in that workshop rather than bought from a trader, so schools, colleges, dealers and importers buy it from the maker, each piece is looked over before packing, and repeat orders are handled by the same team. JLab exports worldwide and ships to buyers in every region — for example Australia in Oceania, Nigeria in West Africa, Sudan in North Africa, Lebanon in the Middle East and France in Western Europe. Tender details are on the lab tenders page.
Other Measuring Instruments for Physics Practicals
- Micrometer Screw Gauge — works on the same screw-and-circular-scale principle, for wire diameters and sheet thickness.
- Vernier Caliper IME Type — a dual-scale caliper for the vernier practical.
- Spherometer Double Disc — the 50 mm table version with a brass bearing.
- Spherometer Demonstration Model — an extra-large model for teaching the reading method.
See the full Measuring Instruments range or the wider Indian Instruments range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button, or send the quantity (minimum 10 units), the circular-scale divisions and pitch you need, and your delivery location through the contact page.
Last updated: 9 October 2026
