These state-of-the-art panel meters are designed for accurate measurement of the AC RMS voltages and frequency in single-phase and three-phase systems. Although they are mainly used in electrical panels , these devices can also be integrated in many other
applications. 

Devices have separate inputs for supply and measurement with common neutral point. Through front panel buttons, phase–to-phase (L1-L2, L2-L3, L3-L1) and phase-to-neutral (L1-N, L2-N, L3- N) voltages and frequency can be selected and read from the display. Automatic parameter scroll is also available