Features: The device uses advanced technology, no need to touch the circuit; the sensor can collect and analyze the signal, and the diagnosis results can be displayed by LED lights and a buzzer. It is easy to check if the car's electronic components are faulty. Automotive oil tester test range: Coils (conventional coils, double spark coils, single spark coils), generators, internal fan motors, combination valves (heating, water cooling), emission control valves, fuel injectors, spark plugs, Hall sensors, relays. Automotive oil tester: Place the probe on the electronic component for testing. If it works normally, there will be a corresponding voice signal and LED flashing to indicate the status. Different wires can be tested on top of the detector with different sensitivities on both sides. Secure the probe to the coil for accurate test results. There is a mode switch on the probe. Level II for normal testing and Level III for strong magnetic field testing. Powered by 2 x AAA battery (not included). Power supply voltage: 7 V Working temperature: 20–50 °C Material: Plastic + metal Color: As shown Package Contents: 1 x Ignition Coil Test Pen Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is ±1–3 cm.