Precisely measure curve surfaces. Heavy circular table with three legs. In order to measure the curvature of the surface, the object is placed centred under the Spherometer and the screw turned until the point just touches it. All three legs and centre screw is of stainless steel, vertical main scale from 10 - 0 - 10 mm, micrometer scale on a circular brass disc with 100 divisions. Glass base plate not included.