General description The Spark Plug Tester JF109 is a diagnostic tool designed to test the performance and ignition strength of spark plugs in 12V gasoline vehicles. It operates by generating high-voltage sparks to assess the condition of spark plugs, helping to distinguish between good and faulty ones. Technical specifications Input Voltage: 100V-240V Operating Voltage: AC110V High Voltage Output: 10,000 volts or more Working Frequency: Adjustable from 1000rpm to 6000rpm/min Measurement Allowed Error: +/- 1-3cm Plug Type: US Plug Material: Plastic Usage Test spark plug performance and ignition strength. To compare a new spark plug with an old one, place the new spark plug in hole 1 and the old one in hole 2. Connect to a power supply and turn the key switch clockwise to activate the tester. Adjust the working frequency to increase spark strength. Other information Package Contents: 1 x JF109 Spark Plug Tester Main Unit Note: The product may have slight differences in appearance due to