Lascar dpm 342 4 to 20ma loop powered panel meter led backlight lascar dpm 342 this compact loop powered indicator provides an accurate zero corrected indication of 4 to 20ma loop current the meter may be calibrated via two multi turn potentiometers allowing precise adjustment of the instrument led backlighting is provided that is powered from the current loop providing a clear display even under low light conditions an integral snap in bezel makes mounting quick and easy lascar dpm 34