Awesome little compact voltmeter w/digital readout. This is a great little compact device to put on top of the power supply, or anywhere else in pretty much any DC electronic system. Hook it up using 3 simple wires.
Ours costs a bit more than other places because we take the time to give each one a full function test, and 100% calibration. No other store offers these displays calibrated. During calibration, we have found that some of these were several volts off - which can lead to damage of any LED system.