How to Use: To prevent interference from adjacent ignition coils, adjust the inductive signal strength first. 1. start the engine and place the probe near the top of the ignition coil. 2. adjust the ignition signal knob, so that the ignition signal light flashes, the probe moves a distance and the lamp is immediately extinguished. 3. adjust the spark voltage knob, so that the screen display value between 10-30KV. 4. respectively detect all cylinders, and then compare the spark voltage values, under normal conditions, the same engine, the spark voltage should be the same or very close. 5. if a cylinder and several other cylinders spark voltage value difference is large, indicating that the cylinder is faulty. The spark voltage of one cylinder is significantly lower than that of other cylinders. Possible causes: 1.ignition coil insulation leakage, turn short circuit, ignition circuit failure, etc. 2. spark plug insulation leakage, small discharge , carbon or oil, etc. 3. low cylinder pressure. 4. ignition timing error. 5. ignition coil or spark plug does not match. The spark voltage of one cylinder is significantly higher than that of other cylinders. Possible causes: 1. spark plug electrode is too large. 2. ignition coil and spark plug poor contact. 3. ignition coil or spark plug does not match. Operation prompt 1. induction probe can not directly touch the ignition coil high voltage part. 2. built-in lithium battery capacity: 400mAh. 3. charging voltage 5V, charging interface TYPE-C. 4. The indicator light is on when charging, and the fully indicator light is off. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color: Black Material: ABS Package Contents: 1 x Auto Ignition System Detector 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.