Name: Precision Spherometer Manufacturer and Supplier in India - STEMAids
Price: 1.69 USD
Availability: InStock

The Precision Spherometer is a mechanical measuring instrument used to determine the radius of curvature of spherical surfaces such as lenses and curved mirrors. It is intended for school and college physics laboratories, optics practicals and technical training where students need to measure small height differences and calculate surface curvature.

Product Description

The STEMAids Precision Spherometer uses three fixed outer legs and a centrally positioned micrometer screw. When placed on a spherical surface, the central screw measures the height or sagitta relative to the plane formed by the three legs. This measured height and the verified spacing of the legs are used to calculate the radius of curvature.

The apparatus supports practical study of screw pitch, least count, zero error, repeated observations and measurement uncertainty. It can also be used for compatible small-thickness measurements by comparing readings on a plane reference surface, subject to the supplied design and approved experiment procedure.

Key Features

Three-leg measuring base: Establishes a stable reference plane on compatible flat or curved surfaces.
Central micrometer screw: Measures small vertical displacement relative to the outer legs.
Curvature measurement: Supports calculation of the radius of curvature of spherical lenses and mirrors.
Graduated reading system: Combines the main scale and circular scale for fine mechanical measurement.
Manual measurement training: Helps students practise pitch, least count and zero-error calculations.
Reusable laboratory instrument: Suitable for repeated optics and measurement practicals when handled correctly.
No electrical supply required: Operates through a mechanical screw mechanism.

Technical Specifications

Specification	Detail
Product name	Precision Spherometer
Brand	STEMAids
Product category	Optical and dimensional measuring instrument
Primary measurement	Radius of curvature of a spherical surface
Measuring arrangement	Three fixed legs with one central micrometer screw
Product-specific standards	No product-specific standard or certification confirmed

What’s Included in the Kit

One Precision Spherometer.
Plane glass reference plate.
Protective storage case
Operating or experiment instructions
Lens, curved mirror, and calibration certificate are not confirmed as included.

Applications / Uses

Measuring the sagitta of a spherical lens surface.
Calculating the radius of curvature of convex or concave surfaces.
Comparing the curvature of lenses and spherical mirrors.
Determining the pitch and least count of a micrometer screw.
Studying zero error, repeated readings and measurement uncertainty.
Measuring small thickness differences where the instrument configuration permits.

How to Use the Precision Spherometer

Clean the three legs, central screw tip and test surface.
Determine the screw pitch and least count from the confirmed scale arrangement.
Place the instrument on a clean plane reference surface and record the zero reading.
Position the spherometer centrally on the spherical surface.
Turn the central screw gently until it just contacts the surface.
Record the main-scale and circular-scale readings without applying excess pressure.
Repeat the observation at suitable positions and calculate the mean displacement.
Use the measured leg spacing and sagitta in the approved radius-of-curvature formula.

Handling note: Do not overtighten the central screw or drag its tip across optical surfaces. Use a clean reference plate and account for verified zero error before calculating the result.

Care & Maintenance

Wipe the screw tip and supporting legs with a clean, lint-free cloth after use.
Store the instrument in a dry protective case with the screw tip retracted.
Do not lubricate the measuring tip or scale unless specified by the manufacturer.
Check screw movement, zero repeatability and scale condition before each practical session.

Why Choose STEMAids

STEMAids supplies scientific laboratory instruments, optics apparatus, educational models and STEM kits for schools, colleges and institutional laboratories. Its range supports practical measurement and experimental learning across physics and other science disciplines. Buyers can explore related physics laboratory equipment, optics laboratory apparatus, general laboratory instruments and the complete STEMAids scientific equipment range. Least count and calibration requirements should be confirmed before technical, tender or export procurement.

Frequently Asked Questions

What is a Precision Spherometer used for?

It is primarily used to measure the radius of curvature of spherical surfaces, including suitable lenses and curved mirrors.

How does a spherometer measure curvature?

It measures the height difference between a central screw and the plane formed by three fixed legs. That height and the verified leg spacing are used to calculate the radius of curvature.

What is the least count of this spherometer?

The least count is not confirmed. It must be calculated from the verified screw pitch and number of circular-scale divisions.

Can a spherometer measure the thickness of a glass plate?

A compatible spherometer can measure small thickness differences by comparing readings with and without the specimen on a plane surface. Confirm that the supplied range and procedure support this use.

Can it measure both convex and concave surfaces?

Many standard spherometers can measure compatible convex and concave spherical surfaces. The specimen size, curvature and instrument range must be suitable.

Does the product include a calibration certificate?

A calibration certificate is not confirmed as included. Buyers requiring traceable calibration should specify the measurement range, points and certificate requirements when requesting a quotation.