This product is a car circuit tester, the fine design makes it perfect for automotive machinery maintenance. Professional performance enables you to easily complete the tests of checking various vehicles electrical circuits, such as test continuity and test the polarity of a voltage. Features -Color:Black -Material:ABS -Size: 15.50X3.00X1.50cm/6.09X1.18X0.59in -Scope of application: DC5-36V -The tester pen comes with indicator light to help detect better and allows you to test safely and carefully. -Powerful but small and light, just like holding a pen while in use, for control as well as for comfort. -The indicator light function enables automotive technician to test the electrical system in the dark night. -Copper probes easily pierce wire insulation to check circuits. Great for checking circuits, and wiring in car. -Can be used to test continuity, test voltage polarity, check lights, check motors, short circuits, test for bad contacts, etc. Package list: 1 x Automotive Tester Pen