Description On Board Voltmeter Use on board switch to change display measurement between the input or output voltage, and a LED indicate which value(IN/OUT) is being measured. This setting is stored even after power off. Voltmeter can be turned off, just keep the switch pressed for 1 second and leave it. Adjust Input and output voltage measurement error offset – long press switch for 4 seconds or more, the digital display flashes, then short press the button to change the value of output (values range from -0.5 to 0.5, the unit is V), a positive number indicates an upward calibration, negative downward calibration. Now press the button again for adjust input offset in same manner.
