Safety of use: This automotive test light ergonomic design handle for a safe grip and comfort. Made of high quality people friendly material, more transparent, shatterproof and sturdy, and can withstand long-term rough use. High quality wire offers more flexibility, lighter and more solid than normal cable wires, will definitely improve your working efficiency Bidirectional Current Voltage Testing: You can utilize an electric tester pen. Connect the alligator clips of the pen to either the negative or positive terminal, and then use the probe to diagnose shorted or defective fuses on the other side Exceptional Quality: The test light automotive features long, sharp stainless steel probes for easy wire piercing and access to tight spaces. Insulated rubber tips provide protection against electric shocks. Crafted from high-quality acetate, the body is shatterproof and more solid than competitors. The premium PU wire is heat and oil resistant, ensuring safe operation Quality Bulb: This automotive circuit tester has a built-in quality light bulb that provides a bright and reliable light indication. High visibility bulb to indicate circuits signal, the brightness of the light will be different with the different measured voltages Wide Application: Multi-purpose automotive circuit tester/circuit test light has a voltage testing range of 6-24V DC. It is ideal for checking electrical circuits in various vehicles, such as turn signal circuits, headlights, taillights, motors, fuse connections, and other 6-24V DC circuits