Feature 1The detector have two testing holes, you can test two spark plugs simultaneously. 2If you suspect any spark plug works improperly you could compare and test to make accurate judgment. 3To test spark plug performance and ignition strength, apply to 12V gasoline vehicles car spark plugs. 4The double hole of the car spark plug tester detector Ignition plug analyzer diagnostic tool can be adjusted. 5You can adjust the working frequency between 1000rpm to 5000rpm/min, the higher the frequency, the stronger the spark strength. Features: 1. The detector have two testing holes, you can test two spark plugs simultaneously. 2. If you suspect any spark plug works improperly you could compare and test to make accurate judgment. 3. To test spark plug performance and ignition strength, apply to 12V gasoline vehicles car spark plugs. 4. The double hole of the car spark plug tester detector Ignition plug analyzer diagnostic tool can be adjusted. 5. You can adjust the working frequency between 1000rpm to 5000rpm/min, the higher the frequency, the stronger the spark strength. Specification: Condition: 100% Brand New Usage: Test spark plug performance and ignition strength Application Range: 12V Gasoline vehicles car spark plugs Main Unit Size: Approx. 145 x 85 x 41mm/5.7 x 3.3 x 1.6in Weight: Approx.341g/12.03oz Power Adapter: Input 100-240V AC / Output 12V 1A DC Plug: US Plug Car Spark Plug Test principle: In automobile ignition system, the high-voltage ignition coil generates a high-voltage (10000 volts or more), and the spark plug diverts it form High -tension ignition coil into the cylinder engine, spark between the spark plug electrodes will ignite the mixture. The Detector could tell the good spark plugs from the bad by the strength of the spark. Car Spark Plug Tester User Manual: 1.Place the Spark Plug into tester hole 1 or 2; If you want to compare the new spark plug and old one, place new spark plug into hole 1 and the old on into hole 2 2. Connect to power supply 3. Turn the key switch 4 clockwise to turn on tester, indicator 3 will light up, tester is now working at 1000rpm/min. 4. Again turn the key switch 4 clockwise, you can adjust the working frequency between 1000rpm to 5000rpm/min. The higher the frequency, the stronger the spark strength. Package List: 1 x Tester 1 x Adapter 1 x Manual Note: 1. Please turn off power before you place spark plug. 2. The spark plug tester is a high-voltage detector, so do not touch spark plug with hand at work to avoid danger. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }