Spherometer Manufacturer,Supplier and Exporter in India
Product Code : EL-PLE-10959
Quick Answer: The Spherometer reads to 0.01 mm: a 48 mm dial with 50 divisions turns on a 0.5 mm pitch steel screw, carried on a 54 mm metal table with three steel legs.
Last updated: October 2026
Key Features
Circular metal table, 54 mm diameter, on three steel legs.
Steel screw, 0.5 mm pitch x 6 mm diameter, in a long adjustable brass bearing.
48 mm dial with 50 divisions of 0.01 mm each, figured clockwise.
Vertical scale on the table in 1 mm divisions.
Suits lenses and mirrors of 50 mm diameter or more.
Flat glass plate, 50 x 50 mm, included for checking zero.
Technical Specifications
Specification
Value
Table
Metal, 54 mm diameter, three steel legs
Screw
Steel, 0.5 mm pitch x 6 mm diameter
Bearing
Long adjustable brass bearing
Dial
48 mm diameter, 50 divisions of 0.01 mm
Vertical scale
1 mm divisions
Range
-7 to +7 mm
Height at zero
Approx. 55 mm
Accessory
Flat glass plate 50 x 50 mm
About This Product
Set on a lens or mirror, the three legs rest on the surface while the screw is turned down to touch it; the vertical scale gives whole millimetres and the dial adds hundredths. Comparing that reading with the zero taken on the glass plate gives the sagitta, from which the radius of curvature is worked out.
Frequently Asked Questions
What is the least count of the Spherometer?
Each of the 50 divisions on the 48 mm dial represents 0.01 mm, and the screw has a 0.5 mm pitch.
What size of lens can it measure?
It is sized for lenses and mirrors of 50 mm diameter or more.
How is the zero checked?
A flat glass plate of 50 x 50 mm is included for checking the zero reading.
