Spark Plug Tester: Descriptions: 1.Dual Hole Tester The car spark plug tester has two testing holes, you can test two spark plugs meanwhile and and if you suspect any spark plug works improperly you could compare and test to make accurate judgment. 2.Wide Application The car spark plug tester is used to test spark plug performance and ignition strength. 3.High-quality and Durable Material The car spark plug tester is made of high-quality and durable material, which could help for a long time. 4.Portable and Simple Operation The car spark plug tester owns a mini size with lightweight, so that you could take it to anyplace with effortle. Specifications Type: Car Spark Plug Tester Quantity: 1PC Material: Plastic Color: Black Plug: EU Plug Input: AC 100-240V Output: DC 12V 1A Size: 14.5*8.5*4.0cm/5.7*3.3*1.6 (L*W*H) Net Weight: 220.0g/7.8oz Adjustable double hole car spark plug tester detector Ignition Plug Analyzer Diagnostic Tool Car Spark Plug Tester Detector with Dual Hole Advantage: Dual Hole Car Spark Plug Tester Detector have two testing holes, you can test two spark plugs meanwhile and and if you suspect any spark plug works improperly you could compare and test to make accurate judgment. Usage: Test spark plug performance and ignition strength Application Range: 12V Gasoline vehicles car spark plugs 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 Using 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. 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. Product Parameters: Main Unit Size:145*85*60mm Main Unit Weight:220G( Not including Power Adapter) Power Adapter: Input 100-240V AC / Output 12V 1A DC