The Surmen DC Digital Voltmeter is a low cost way to measure DC volts in the range of 3 to 30 volts.
The refresh rate is 500mS. Error is 1%. Size is 24x15x10mm. The digits are 0.36 inches high.
The meter has three wires:
Red Wire: DVM Power "+" (3-28VDC)
Black Wire: DVM Power "-" and Sense "-"
White Wire: Sense "+"
To measure voltage from a power supply, short both the white and red wires to "+".
Please note that this DVM does not include any mounting hardware.
Some users simply use double sided tape for a quick install. _
||DC DVM BLU