Checks for lack of ignition. Convenient for intuitive understanding of ignition coil function. Easy to read: Clearly visible white lettering makes it easy to read the measurement gap. Coil quality can be determined by spark color and distance. Quick and easy installation with screws for electrode gap adjustment. Prevents ignition coil burnout and ignition. Prevents ignition coil burnout and ignition. Alligator clips for a secure connection to ground. Quick and easy installation with screws for electrode gap adjustment. Convenient for intuitive understanding of ignition coil operation. Detects dirty spark plugs, bad points, bad wires, etc. Material: Metal Diameter: 22mm Length: 115mm Please allow 1-2mm deviation. 2cm due to manual measurement. There may be slight color differences between the pictures and the actual item. Package includes: 1 x Spark Plug Tester