Hign-concerned Chemical:NoneOrigin:Mainland ChinaAbout this product [LED indication, bidirectional voltage test ] This upgraded circuit test light is a bidirectional voltage tester. You can fix the crocodile clip on the negative or positive ground, and there is also a LED on the circuit board for polarity indication. The red light indicates positive polarity, and the green light indicates negative polarity. [ Wider voltage range ]Compared with automotive electrical testers on the market, the maximum voltage measured is only 90V, but our technology can upgrade the maximum voltage measured to 90V. The circuit test is very suitable for checking various vehicle circuits, quickly checking car headlights, taillights, turn signal circuits, faulty sockets, fuse connections, and testing other 5-90V DC wiring and circuits. [ Computer security, durability, and flexibility ]: Professional automatic circuit testers have built-in circuit board chips, which are safer and more durable than traditional test lights, preventing car computer boards from burning out. The spring wire can be freely stretched to 102 inches (approximately 259.1 centimeters), with a wide measurement area; The tail line adopts an anti bending design, without worrying about contact with the fishing line. [ 100% satisfaction ]: If you have any dissatisfaction for any reason, please feel free to let us know and we will do our best to help you.