BSI BS 89-1
BS BS 89-1 1990-JAN-01 Drect Actng ndcatng Analogue Electrcal Measurng nstruments and Ther Accessores Part 1 Specfcaton for Defntons and General Requrements Common to All Parts-AMD 8831 December 15 1995 Superseded by BS BS EN 60051-1
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General requirements for ammeters, voltmeters, wattmeters, varmeters, frequency meters, phase meters, power factor meters, synchroscopes ohmmeters, impedance meters, conductance meters and multi-function meters of all types.