Direct acting indicating analogue electrical measuring instruments and their accessories. Recommended test methods|Testing conditions, Errors, Varmeters, Adjustment, Electrical measuring instruments, Power measurement (electric), Power factor, Marking, Thermal-cycling tests, Voltmeters, Ammeters, Analogue signals, Accessories, Frequency measurement, Meters, Overvoltage tests, Electrical testing, Electrical wave measurement, Wattmeters, Signal devices, Instrument shunts, Vibration testing, Resistors, Performance testing, Magnetic field effects, Phase measurement (electric)