3-1/2 large (.6" tall segments) red LED voltmeter display with solder pads for wire connections. Solder jumpers to change voltage ranges and decimal point location for use with back boards for conversion to DC amps, AC amps, AC hz, AC volts, and thermocouple temperature display. See other instrumentation products for options for this universal display module. Voltage ranges are 0 to 199.9mv, 0 to 1.999v, 0 to 19.99v (12 volt application), and 0 to 199.9 volts. When using the Backboard/VM-1 combinations the current ranges depend on the current shunts for DC amps and current transformers for AC amps but almost any display readout combination is possible. For thermocouples the temperature range is up to 1999 degrees F. This is a 1% accurate display that includes the 4 wire connection wire stub, panel mounting hardware. Optional smoked lens (bezel). Powered from 12vdc @ 100ma (24vdc option at increased cost).