The Lapmaster Flatness Gauges provides a quick, reliable method of inspecting lap plates, polishing plates, surface plates and other large surfaces for flatness. The Flatness Gauge determines flatness by measuring the deviation from a straight line on a plane determined by the gauge body. This deviation, convex or concave, is then read directly in .0001 increments on a dial indicator (digital indicators also available).
Lapmaster manufactures flatness gauges with 4-3/8" between centers for plates up to 15" diameter and 9-3/8" between centers for plates of 20" diameter and larger. Lapmaster also manufactures a line of flatness gauges specially designed for use with dual face machining plates.
