Lascar dpm 742 bl 3 5 digit lcd panel meter 4 20ma loop powered with backlight lascar dpm 742 bl this panel meter is designed to provide an accurate zero adjusted indication of a 4 to 20ma loop current calibration is via two multi turn potentiometers that allow sensitive adjustment over a wide range a low drift bandgap reference circuit ensures accurate reading over a wide temperature range led backlighting is provided that is powered from the current loop providing a clear display even