Lascar dpm 40 3 5 digit led panel meter lascar dpm 40 this compact meter uses leds for the display creating a meter that has excellent readability under all lighting conditions the high efficiency leds together with the integral red filter ensure a high contrast the meter may be easily scaled to indicate volts amps or other engineering units and may also be used in single ended differential or floating input modes lascar dpm 40 3 5 digit led voltmeter