The tester pen can test 12-250V voltage and indirectly test AC neutral wire, phase line and breakpoint. It can show 220V at most. Press the "direct" button can directly test AC voltage Press the "inductance" button can test DC voltage Use the pen tip to test AC phase line and neutral wire, if something display, it is the phase line. The pen tip move along the phase line, if nothing display, it is the breakpoint Please dont press the two buttons at the same time. Type: Electrical Tester Pen Material: Engineering Plastic Shell Testing Range: AC DC 12V-250V Features: "Direct" and "Inductance" Mode, Easy to Operate Color: As the Pictures Show (We do not offer color choice, your color will be randomly sent) Length: 13cm/5.12" (Approx.) Notes: 1. Due to the light and screen setting difference, the items color may be slightly different from the pictures. 2. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Electrical Tester Pen (Sent Randomly)