The dualhole car spark plug tester has two test holes, allowing you to test two spark plugs at the same time. If you suspect that a spark plug is not working properly, you can compare and test to get an accurate assessment.Used to test spark plug performance and ignition strength, suitable for spark plugs in 12V gasoline vehicles. pAdjustable spark plug tester for car with double holes, glow plug analyzer, diagnostic toolAdvantages of dualhole spark plug tester for carsThe dualhole car spark plug tester has two test holes, allowing you to test two spark plugs at the same time. If you suspect that a spark plug is not working properly, you can compare and test to get an accurate assessment.Purpose of testing spark plug performance and ignition powerApplication area spark plugs for 12 V petrol vehicles.Principle of testing spark plugs for carsIn a cars ignition system, a highvoltage ignition coil generates a high voltage of over 10,000 volts, which is converted into highvoltage electricity through the spark plug.The highvoltage ignition coil enters the engine cylinder, sparks are generated between the spark plug electrodes and the mixture ignites. The detector can determineThe quality of a spark plug depends on the strength of the spark.Precautions when using the spark plug tester for cars1. Turn off the power before inserting the spark plug2. The spark plug tester is a highvoltage detector. Do not touch the spark plug with your hands during operation to avoid danger.Automotive Spark Plug Tester User Manual1. Insert the spark plug into test hole 1 or 2. If you want to compare the new spark plug with the old spark plug, insert the new spark plug into hole 1 and the old spark plug into hole 2.2. Connect the power supply3. Turn the key switch 4 clockwise to turn on the tester, the indicator light 3 will light up and the tester will run at 1000 rpm.4. Turn the key switch 4 clockwise again to adjust the operating frequency between 1000 rpm and 5000 rpm.The higher the frequency, the stronger the spark intensity.Product parameters of the spark plug tester for gasoline vehiclesL size worth 1458560mmHost weight 220 G excluding power adapterPower adapter 100240 V AC input12V 1A DC output.The Spark Plug Tester for 12V Petrol Vehicles test set includesSpark plug tester 1 pc1 power adapter