This standard applies to pressure gauges, vacuum gauges and pressure–vacuum gauges (ordinary instruments) with elastic sensing elements, intended for the measurement of the pressure (i.e. gauge pressure, or vacuum, or both) of liquids, vapours and gases by direct indication using a dial and a pointer (indicating instruments) or by continuous recording as a function of time (recording instruments). The application of this standard is limited to instruments in which the elastic deformation of the sensing element is mechanically transmitted to the indicating or recording device graduated in legal pressure units, and in which the upper limit of the measuring range is between 0.05 MPa and 1000 MPa. Note: Recording instruments covered by this standard may be: – single or multi-channel recorders, – with a chart in the form of a disc, strip or sheet, – with one or several separate recording areas, – instruments in which the movement of the chart as a function of time is ensured by a clock-work mechanism or an electric motor or both