Economy spherometer instrument used to measure the radius of curvature of a sphere or curved shape, most commonly of a lens. Used in optometry. Features a fine screw moving in a nut on a three-legged frame forming a triangle. Based on the principle of screw. Consists of a base circle of three legs, a central leg that can be raised and lowered, and a reading device. Made of high quality brass and stainless steel. Built to last.

Measurements:
– 40mm diameter dial head
– 1mm pitch with 0.01mm count
– 10-0-10mm vertical main scale
– 10mm on prongs with micrometer scale with 100 divisions.

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