E-line meters with a moving iron are intended for measurement of AC currents or voltages with frequencies from 15 Hz to 100 Hz.
They measure rms values independently on the signal form of current or voltage. The accuracy class is 1.5. As the beginning of the scale is non-linear, reading from 15% of rating onwards is possible. Ammeters with rating for double, triple or even six-time value of rated current are available on request. The overload range is extremely non-linear. Delivered with interchangeable scale.