Check the listing for details. Digital Automotive Test 6-24V Car Power Electrical Circuit Tester Open Circuitte. Condition: New. Listed at 17.99 USD. Car Circuit TesterThis Automotive Multifunctional Electrical System Testing Tool is a 6-24V DC power supply probe. This device is the best electrical tester for reducing the diagnostic time of automotive electrical systems. Its long cable makes testing easy. Only by connecting the device to the battery of the car, the car technician can conduct the positive and negative current of the battery to the needle tip by turning the switch forward or backward. This machine has short-circuit protection, if the grounding is bad, it can be checked immediately. It allows you to track and locate short circuits. You can also test for continuity with the help of auxiliary ground wires.INDICATOR&BUZZER PROMPTIndicators and sounds help you complete your work quickly.OVERLOAD PROTECTIONReverse connection/overload protection, make you more safe and reliable at workPOLARITY TESTHelp you quickly identify positive and negative polarities of vehicle cables and plugs. Polarity test:When the polarity of the circuit under test is unknown, the positive and negative poles of the circuit can be tested.(Red light indicates positive pole, green light indicates negative pole)Open circuit test:With the polarity of the circuit under test unknown,it can be tested to see if the circuit is in a continuous state or in an open-circuit state. (The green light is on means the circuit is in a continuous state; the green light is off,it means the circuit is open)Diode test:Quickly test the working status of the diode assembly and determine whether the circuit is open or continuous.Grounding test:It can detect whether the component has a large current flow, and test whether the negative grounding of the component is good.(The green light is on with a beep, indicating that the grounding is good; the green light is on without beep, indicates poor grounding.Pakage Includes 1pc* Car Circuit Tester main unit1pc* user manual Car Circuit Tester Polarity TestOpen Circuit TestDiode TestGrounding TestOperation Voltage 6-24V DC