Precision Sphereometer

surfaces, for example, lenses.
The device consists of a tripod with three steel tips which form an equilateral triangle. A micrometer screw with a measuring tip is recessed in the middle. Attached to the micrometer screw is a disc with circular divisions from 0 to 500 and a vertical scale with millimeter divisions from -10 to 15 mm at the tripod.
Measuring ranges: 0 – 25 mm and -10 – 15 mm
Screw pitch: 0.5 mm
Measuring accuracy: 0.001 mm
Support spacing: 50 mm