Feature: 1. Hand‑held Coil On Plug fast ignition tester, battery powered, with stable and professional performance. 2. Designed to easily and quickly determine whether the COP produces the proper spark for the 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 whether the COP produces the correct amount of voltage and arc duration. 5. If the voltage is correct, the tester will beep and the red LED indicator 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, 120mAh (built-in) How to Use: 1. Correctly connect the connector and sensor head to the tester 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 result of lighting Test Results: Red LED Light Consistent, steady flashing and beeping indicates the COP is producing the correct amount of voltage. No response or an inconsistent response indicates the COP is NOT producing the correct amount of voltage. This may be caused by one of the following: 1.Fouled spark plug, or incorrect gaps 2.Damaged/corroded wires or connectors 3.Faulty coil or PCM Green LED light Consistent and steady flashing indicates the duration of the arc is correct. No response or an inconsistent response indicates the duration of the arc is NOT correct. This may be caused by one of the following: 1.Shorted windings inside the coil 2. Resistance or bad connections in the 3. primary / secondary connections 4. Faulty coil . Package List: 1 x Ignition Coil Tester1 x Adapter Lever1 x Sensor 1 x Manual 1 x Storage Bag