Features: The device uses advanced technology, no touch of the circuit is required. The sensor can collect and analyze signals, and diagnosis results are 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 includes: 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, and relays. To use, place the probe on the electronic component for testing. If the component is functioning normally, a corresponding o signal and LED flashing will indicate the status. Different wires can be tested using the top of the detector, with different sensitivities available on both sides. Secure the probe to the coil for accurate test results. The probe has a mode switch: Level II for normal testing and Level III for strong magnetic field testing. Powered by 2 x AAA batteries (not included). Power supply voltage: 7 V Working temperature: 20–50 °C Material: plastic and 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 differences in display screens may cause slight variations between the color of the item in the picture and the actual product. Measurement error allowance is +/- 1–3 cm.