Model #5-1640

6660-01-056-0923

Knife edge outer contacts 14.53 mm apart; ball ctr contact 3.0 mm; measures convex, concave and toroidal surfaces porm 20 diopters in 0.1 d div; 1.0mm corresponds to 1.0 diopter; 1.0 full revolution of pointer equals 10.0 diopters; scale markings, convex black figures, concave red figures; w/plasticbox, instructions and calibration flat

Spherometer

04562