It can test effectively the profile, surface shape, size, angle and position of various complex work-pieces, especially is used in microcosmic inspection and macroscopic control of precise parts. So it is widely used in different measuring rooms and workshop抯 inspection stations in various industries, such as electron, instrument & meter, cutter & clamp, precise machine elements, precise hardware, electronic component, plastic and rubber finished-product, semiconductor component, the punching piece, mould, automobile, machine work, military industry, aerospace industry, college & university, science research institute etc.