about this project WIDE APPLICATIONCircuit test light with DC 3-36V low voltage test range, designed to check various vehicle circuits, such as car headlights, tail lights, turn signal circuits, faulty sockets, fuse connections, also can be used to test other 3- 36V wiring and circuits. In addition, the positive and negative poles of the battery can also be judged by the red and green LED indicators. Clear Digital Display and LED IndicatorsThe circuit light tester has an ultra-clear LCD display with a resolution of 1V voltage readings and an accuracy of 0.2V. And when judging the polarity of the power supply, the two LED indicators will light up in different colors to make a judgment. Three-Position SwitchThe circuit light tester with three-position switch. Stop at 3rd gear, 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 the positive pole of the power supply, and the green light indicates the negative pole of the power supply. Sharp Pure Copper ProbesThe pure copper probes of the voltage tester are not rusty and have good conductivity. It's sharp enough to easily pierce wires and get into tight, hard-to-reach areas. The body is insulated so you can work safely. TPU Spring Wire & Alligator ClipThe extended TPU spring wire can be applied to more scenarios. It is more flexible than ordinary yarn and easier to organize and store. The pure copper alligator clip is very strong, does not slip, and is very convenient to use...