1. Battery-powered, coil-on-plug quick ignition tester, with stable and professional performance. 2. Designed to easily and quickly determine if the COP is producing the correct spark for the spark plug. 3. It works by receiving the signal from the secondary ignition coil and the test result is accurate and reliable. 4. Once the signal is received, the tester will determine if the COP is producing the correct amount of voltage and arc duration. 5. If the voltage is correct, the tester will beep and the red LED light will flash; If the arc duration is correct, the green LED will also flash. Specification: Item Type: Ignition Coil Tester. Material: ABS Battery: CR2032 button battery, 120 mAh (built-in) How to use: 1. Connect the connector and sensor head to the tester correctly 2. The induction head is aligned with the ignition coil to start working, and the working status of the ignition coil is judged according to the lighting result Test Results: Red LED Light Constant and regular flashing and beeping indicate that the COP is producing the right amount of voltage. No response or an inconsistent response indicates that the COP is NOT producing the correct amount of voltage. This may be caused by any of the following: 1. Dirty spark plug or incorrect gaps 2. Damaged/corroded wires or connectors 3. Faulty coil or PCM Green LED light Constant, regular flashing indicates the duration of the ignition 'arc is correct. No response or an inconsistent response indicates that the arc duration is NOT correct. This may be caused by any of the following: 1. Shorted windings inside the coil 2. Resistance or poor connections in the 3. Primary/secondary connections 4. Faulty coil Package List: 1 x Tester ignition coil assembly 1 x lever adapter 1 x sensor 1 x manual 1 x storage bag