Features:1.Voltage and positive and negative detection: When the device is connected to the car's power supply, the display lights up white and the screen will show 0v. When the probe is touched to the positive circuit, the screen will show the current circuit voltage. (If the device power supply and the circuit being tested are separate, then the ground lead of the device needs to be connected to the negative terminal of the circuit being tested). If the probe touches the negative circuit, the display will light up green, the screen will show 0v, and the device will sound a beep.2. Diode detection: Connect the ground lead to the negative terminal of the diode and the probe to the positive terminal of the secondary tube, when the icon appears on the display and a voltage value is shown, the diode is good, if the display does not respond or the screen shows green and the device beeps, the diode is bad.3.Component activation: The activation function can be used to activate components such as the starter fuel pump, solenoid, blower, cooling fan, headlights, etc. Connect the grounding auxiliary clip to the negative terminal of the part, the probe contact to the positive terminal of the part, then press the positive activation button (-), the probe will output a positive voltage, the screen will light up red and display the current activation voltage, and the part will be activated at the same time. Probe can output positive and negative voltage, press the (-) button probe output positive voltage, press the (=) button probe will output negative voltage, activation output maximum current is 8A, more than 16A equipment will start trip protection function.4.Continuity testing: By using the probe tip and an auxiliary ground wire, continuity testing can be performed on wires and components that are disconnected from the vehicle's electrical system. When the continuity test is passed the display lights up green and the unit beeps. (Note: Do not press the activation switch during the continuity test.)5.Grounding detection: Use the probe to make contact with the negative terminal of the component. When the ground test is passed, the display will light up green and the device tone will sound. (Note: Do not press the activation switch during ground detection.)6.Test trailer lights and connectors: Connect the device to the battery, clip the clip of the auxiliary ground wire to the trailer ground, connect the probe to the socket of the trailer connector, and press the (-) button to detect the function and direction of the trailer light.7.Jumper lead function: Black clip and auxiliary ground wire directly connected through the device, the red clip and vehicle battery disconnected, the device can be used as a long jumper lead, (note that when the device is used for jumper function, please pay attention to avoid short circuit and overload, jumper lead function is not protected by the device circuit breaker).8.Track and locate short circuits: In most cases, a short circuit will manifest itself as a blown fuse or a tripped electrical protection device (such as a tripped circuit breaker). To trace and locate a short circuit, remove the blown fuse from the fuse box; use a probe to touch each fuse contact; the line that lights up green and beeps on the equipment display is the shorted line, note the line number or color, and follow the wire as far as possible to trace the harnessIf you are tracing the brake light short circuit, first the harness must pass through the threshold of the wire, find the color or number of the wire and mark it. If the display lights up green and a tone sounds, you have verified that the wire is shorted. Follow the wire to the exact location. Repeat this procedure in the direction of the short circuit until you find the exact location of the short. ParametersItem name: Automotive Electrical Circuit TesterModel: P60Supply voltage DC: 6-30VMeasuring voltage range: 0.3V-70VOperating current: 80mAActivation current: 0-8AOperating temperature: 0 to 60CStorage temperature: -40 to 70CCable length: 4MWeight: approx. 210gWhat you get: Automotive Electrical Circuit Tester. User manual. Carton package. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.