Function Continuity tester for testing components inside and outside the vehicle electrical system: This electrical tester can be used to test and activate components inside and outside the vehicle electrical system, testing voltage polarity, relays and diodes, fuses and circuit continuity, checking lights, checking motors, Track and locate short circuits, test for poor grounding, test cable and plug polarity, measure 2V to 24V DC voltage, etc.Contains 1 x Power Scan, 1 x Probe Tip, 1 x Battery Hookup Clips, 1 x User Manual, 2 x red clips. Lead length: about 4M / 157.Sinch, which is convenient for you to measure the polarity of the vehicle's various orientation circuits.Application 1 Clamp the red clip on the positive pole of the car battery, 2 Clamp the black clip on the negative pole of the car battery, 3 Connect the car power probe to the bad point of 6-24V DC. You can conduct positive and negative battery currents to the probe by shaking the power switch forward or backward. The cable length is about 4m. The device has short-circuit protection, when the current exceeds 7A, the device will automatically cut off the current.Features Power Circuit Probe Kit has two obvious reminders, sound and flash, so you can still use it even in low light conditions. Sound:Beep. There are operation videos below, which can be watched in detail.Remind Do not use this item near explosive gas, vapor or dust. When pressing the power switch (Note: or shaking), the battery current will be directly conducted to the pen tip, which may cause Sparks can be caused when touching the ground or certain circuits. Do not use the device under 11o/220V indoor current, only for DC6~24V systemThere are detailed instructions in the product box, please refer to the operation.The power circuit probe tester can be used to test uncertain contact polarity in vehicles. When the it touches the positive pole, the indicator light will turn on red, and when it touches the negative pole, it will turn on green. In addition to polarity testing, the power short circuit finder can also perform continuity testing, it is mainly to test whether the circuit has continuity and whether it is short-circuited.