AUTOOL Spark Plug Tester Automotive Engine Ignition Coil Tester 200-9000rpm Adjustable Working Frequency, Three Holes Spark Plug Gap Tool with Protective Cover for All 12V Gasoline Vehicles (SPT301)

["【Adjustable Working Frequency & Protective Cover Protection】The working frequency of the spark tester automotive is 200-9000rpm. The higher the frequency, the stronger the spark intensity. The working frequency can be adjusted by the button, you can adjust it according to your needs, it is very convenient. The spark plug tester performance and ignition strong, with protective cover to prevent you to electric danger."]