Tests for lack of ignition status. Convenient to intuitively understand ignition coil operation. Easy to read - high visibility white lettering , which makes it easier to read the measurement deviation. According to the color of the spark and the distance of the sparkle, you can determine the quality of the coil. Mounting with screws to adjust the spark gap, quickly and easily. Prevent the ignition coil from igniting and consuming. Prevent the ignition coil from igniting and consuming. Alligator clips that securely connect to ground. Mounting with screws to adjust the spark gap, quickly and easily. Convenient to intuitively understand the operation of the ignition coil. Find dirty ignition plugs, bad points, bad cables or connections, etc. Material: Metal Diameter: 22 mm. Length: 115mm. Please allow 1-2cm differs due to manual measurement, thanks. There could be some slight differences in the color tone of the colors of the pictures and the real object. Package includes: 1 x Candle Tester