Lascar dpm 3as bl 3 5 digit lcd voltmeter panel mount lascar dpm 3as bl a 3 5 digit panel mounting voltmeter with a 200mv measurement range and led backlighting a negative rail generator allows the meter to measure a signal referenced to its own power supply ground the housing design enables the meter to be easily snapped into a panel lascar dpm 3as bl 3 5 digit lcd voltmeter