To avoid the possibility of electronic shocks and harm to human:
The protective function may be influenced if not follow the instruction.
If there is no data on the screen pls do not use it.
Before using pls make sure you are testing on the electronic power to make sure the tester pen is working in the best condition.
The voltage exists even if there is no display or sound alarm when using the voltage tester pen. This voltage tester pen detects the effective voltage engendered by the power supply which has sufficient static field.
If the static is weak, the tester pen can’t detect the voltage, and the voltage may be inflected by following reasons includes but not just: shield cable, the insulating layer types & thickness, the distance from the power supply, the insulator, the difference of the socket design. pls send for maintenance.
Pls do not test the voltage over the measuring range.
Pls be very careful when testing above ACV 36V since such high voltage is dangerous.
Pls follow the local safety rules and use the tester pen correctly.