Compared with current circuit tester, automotive test light adopts advanced tecknology to rise the max voltage to 100v, while other's max voltage is 48v; the auto circuit tester is a perfect tool for testing and troubleshooting, such as automotive headlights, taillights, faulty sockets, fuse. The professional automotive circuit tester defaults to SMART mode. Automatically senses between DC voltage, continuity and resistance testing without having to change any settings for the highest precision, making it easy to use Buzzer sounds during continuity testing. 0.1 V resolution ratio with high accuracy. The test light with voltage display features a bright green backlight LCD digital display that provides accurate volt readouts, clear and visible for day and night The probing end of test light is made of high quality copper, boasting better electric conductivity than stainless steels; probe can easily pierce wires or have a proper connection to a fuse in the fuse panel; or for hard to reach tight areas. Insulation protective rubber tip protects you against and avoid incident hurt Maximum 78 inch long decent cable increases flexibility and match your care length. Along with large size copper clamp for easy one-hand operation. Friendly reminder: The car circuit tester does not include batteries. You need to purchase 1 AAA battery separately. Color: As Shown Material: Metal+Plastic Package Contents: 1 x automotive test light Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.