Lascar SP 400 Series 3.5 Digit LCD Panel Meters - Lascar SP 400-EB-W, This 3.5 digit LCD panel mounting meter has white LED backlighting on an enhanced black LCD background for excellent readability in low light conditions. A negative rail generator enables the meter to measure signals that are referenced to its own power supply GND. The low cost and high performance of this unit means it is ideal for high and low volume applications in applications such as precision instrumentation systems, power supply monitoring, test boxes, panel mount indication, low power voltage/current measurement. Lascar SP 400-EB-W 3.5 Digit LCD Voltmeter