Product name: car voltage detection electric penSales unit: 1 PcsProduct material: metalTest range: 6-24VFrequency range: 50/60HzThe main function:(1) It can be used for low-voltage nuclear phase, measuring whether any wires in the circuit are in phase or out of phase.(2) It can be used to distinguish between alternating current and direct current.(3) It can judge the positive and negative poles of direct current(4) It can be used to judge whether the DC is grounded.