[Wide range of applications] The power sensor can be used to test conductivity and test voltage polarity. It can detect lights, motors, trace and locate short circuits. This helps us quickly find out if there is a short circuit or poor contact in the vehicle's electrical system components. [Test Cable Length] The cable is approximately 16 feet long, making it easy to test any electrical system. [Short Circuit Protection] The circuit tester has a short circuit protection function, which can detect poor grounding immediately. [Simple Operation] After connecting the circuit tester to the vehicle battery, the auto technician can conduct the positive and negative current of the battery to the probe by moving the power switch forward or backward. [Wide Compatibility] This car circuit probe is suitable for all 6-24V DC car electrical frames. The 16 inches of extra wire can be used anywhere on vehicles, trucks and trailers and can be tested along the entire length of the vehicle without having to keep searching for the right vehicle to test on. Colour:Red Material:plastic Size:18x7x3cm Package Contents: 1 * Electrical system tester 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.