Lascar DPM 750 Series 3.5 Digit LCD Voltmeter Module with Backlight – Lascar DPM 750S-BL, This panel meter features a low drift bandgap reference circuit that ensures accurate readings over a wide temperature range. A negative rail generator enables the meter to measure a signal referenced to its own power supply GND. LED backlighting makes the meter easy to read in low light conditions. The unit is supplied with a plastic mounting bezel and there is an additional bezel available (87-6380) that will provide a waterproof seal to IP67. Lascar DPM 750S-BL 3.5 Digit LCD Panel Meter