2021BS EN IEC 60051-9:2021 Direct acting indicating analogue electrical measuring instruments and their accessories. Recommended test methods
1990BS 89-9:1990 Direct acting indicating analogue electrical measuring instruments and their accessories - Recommended test methods
BS EN IEC 60051-9:2021 Direct acting indicating analogue electrical measuring instruments and their accessories. Recommended test methods was changed to BS 89-9:1990 Direct acting indicating analogue electrical measuring instruments and their accessories - Recommended test methods.