Handheld Coil On Plug fast ignition tester, battery powered, with stable and professional performance. Designed to easily and quickly determine whether the COP produces the proper spark for the plug. It works by receiving the signal from the secondary ignition coil, and the test result is accurate and reliable. Once the signal is received, the tester determine whether the COP produces the correct amount of voltage and arc duration. 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 , or incorrect space 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 Colour:As Shown Material:ABS Package Contents: 2 * Ignition Coil Tester(without 1 x R2032 button cell) 2 * Adapter Lever 2 * Sensor 2 * Storage Bag Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.