To test the voltage: Turn the switch to the VOLT, connect the clip to GND, the voltage value and waveform will be displayed on the screen, if the voltage value is larger than 0.5V, the blue LED lights on.
To test circuit continuity: Turn the switch to CIRC. If the clip is short to the test pen, the red LED lights on, the screen will display the message as shown in the left figure; Otherwise, if the clip is open to the test pen, the screen will display the message as shown in the left figure.
To power off the VoltPen: Turn the switch to OFF. Power off automatically after a few minutes, Before you can use it again, turn the switch to OFF first, then wait for 10 seconds.