Features: The device uses advanced German technology, no need to for touch the circuit, the sensor can collect and analyze the signal, the diagnosis results can be displayed by LED lights and 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, Dingle 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 show the park. 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). Specifications: Material: ABS Size: Approx.15x2cm/5.90x0.79in Power supply voltage: 7 (V) Working temperature: 20-50 (C) Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Fault Test Pen