Wide application The circuit test lamp with DC 3-36V low voltage test range, designed for checking various vehicle electrical circuits, such as automotive headlights, taillights, turn signal circuit, faulty sockets, fuse connections, also useful for testing other 3-36V wiring and circuits. In addition, the battery positive or negative can also be judged by the red and green LED indicators. Clear digital display and LED indicatorsThe circuit light tester with super clear LCD screen, resolution to 1V of voltage reading with 0.2V accuracy. In addition, when judging the polarity of the power supply, the two LED indicators each other. light up in different colors to make judgments. 3 position switch The circuit light tester with a 3 position switch. The 3 gears are stopped, judge the positive and negative poles of the battery and test the voltage. When judging the positive and negative poles of the battery, the red light indicates that the power supply is positive, and the green light indicates that the power supply is negative. Sharp pure copper probeThe voltage tester has a pure copper probe that does not rust and conducts very well. It's sharp enough to easily pierce wires and get into tight, hard-to-reach areas. The fuselage is isolated, so you can work safely. TPU spring wire and alligator clips Extended TPU spring wire can be applied to more scenes. It has more flexibility than regular yarn and is easier to organize and store. The pure copper alligator clip is very firm, does not slip, and is very convenient to use.