Granite rulers are mainly used for precision grinding and scraping processes on working surfaces, and are used to inspect unevenness and straightness in machine tool inspections. The two working surfaces are used in conjunction with block gauges, micrometers, level gauges, and other instruments to inspect the parallelism and non connection of two guide rails at different heights;

A granite ruler can be used in conjunction with a square ruler to measure the verticality of two components that cannot be inspected with a square ruler alone;

Granite rulers are also suitable for equipment installation and inspection, with a usage temperature of (20 ± 5) ℃.

Granite ruler specification (mm), working face straightness or flatness, parallelism between working faces, perpendicularity of side to working face