Application Display The digital Weigel Power Meters have been designed to display electrical parameters in low voltage systems. WPM 600 B - Z is suitable for use in 3 - phase 4 - wire systems 230/400 V. This panel meter displays the following electrical parameters: voltage, current, active power, reactive power, power factor, frequency, active energy and reactive energy. The ratings are displayed one after the other or can be selected by pressing a button.