Wide range of tests: The circuit test lamp has a low voltage test range of 3-36V DC, designed to verify various vehicle electrical circuits. Such as headlights, taillights, turn signal circuits, faulty plugs, fuse connections, also useful for testing other cables and circuits of 3-36V. In addition, the positive or negative polarity of the battery can also be judged by the red and green LED indicators. 3-position switch: The circuit test tool features a 3-position switch. The 3 positions are stop, judge the positive and negative poles of the battery, and measure the voltage. Clear digital LCD display and LED indicators: The test tool features a super clear LCD display. Voltage reading resolution up to 1V with an accuracy of ±0.2V. Also, when judging the polarity of the power source, the two LED indicators light up differently to make judgments. The red light indicates that the power source is positive and the green light indicates that the power source is negative. Sharp pure copper probe: The voltage test tool has a pure copper probe that does not rust and conducts very well. It is sharp enough to easily pierce wires and reach narrow and hard-to-reach areas. The body is insulated, so it can be worked with safely. TPU spring cables and alligator clips: The extended TPU spring cable can be applied to more scenarios. It is more flexible than regular wire and easier to organize and store. The pure copper alligator clip is very firm, does not slip, and is very convenient to use. ZKTOOL provides technical support and service without reservation.