DUHALINE Electrical Test Pen with Led Indicator Voltage Checker Pen Socket and Cable Tester

Hello, this product is mainly designed for AC power line and socket control. It is not suitable for reliably measuring the 12 V DC current in vehicles. If checking the car electrical system, a multimeter capable of measuring DC voltage or a 12V-24V automotive test pen should be used.

Hello; If the check is done from a close and accessible point to the cable or socket, it can help determine whether there is electricity or not. However, for the hidden cables behind the wall, the plaster, wall thickness and the location of the cable may affect the measurement. Therefore, it is more accurate to use a special wire detector/wall scan device for in-wall wire detection.