Meters with a moving coil and a rectifier are intended for measurement of AC currents or voltages in the frequency range from 40 Hz to 65 Hz (higher frequency range on request), where low meter consumption is required. The meters measure the mean value of rectified current or voltage. The scale is expressed in rms values at the sine form of the measured quantity. Distortion or deviation from the sine form of more than 1% entails additional errors. The scale is interchangeable. The accuracy class is 1 &1.5.