The GAR Precision Reference Standard shows actual patch mean values certified by the National Institute of Standards and Technology.

An economical calibration standard for surface analyzing equipment. Ra values 119.5 and 16.1; includes certification traceable to N.I.S.T., individually serialized, calibrated and certified Reference Standards are also available.

The GAR Precision Reference Standard provides an economical calibration tool which permits the technician to calibrate surface analyzing equipment to its peak efficiency. It is the only calibration block on the market to show the actual patch mean values of low and high microinch surfaces and certified by the National Institute of Standards and Technology. (N.I.S.T.).

The surface of the Precision Reference Standard consists of a series of parallel, uniform, "V-shaped" grooves having an included angle of 150° between the sides. Since the surface character of the Precision Reference Standard is unlike normally machined surfaces, it is not recommended for use in visual and actual comparison.