This standard applies to pressure balances equipped with either a simple-type or a re-entrant type piston-cylinder assembly, with direct loading, and which are used for measuring gauge pressure in the range from 0.1 MPa to 500 MPa. This standard specifies the metrological and technical requirements applicable to these instruments, the methods for their testing, and the format of the test report. It also applies to the adjustment of weights used with pressure balances and to the calibration of pressure balances in cases where high accuracy is required. The standard does not apply to pressure balances with hydraulic multipliers, indicator-type pressure balances, pressure balances with the piston loaded by means of a lever-arm, controlled-clearance pressure balances, and pressure balances with electromagnetic balancing. It also does not apply to instruments that measure absolute pressure.