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. Wide Application :The car spark plug tester is used to test spark plug performance and ignition strength. 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. Portable and Simple Operation :The car spark plug tester owns a mini size with lightweight, so that you could take it to anyplace with effortless. 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. Type: Car Spark Plug Tester Input: AC 100-240V Output: DC 12V 1A Usage: Test spark plug performance and ignition strength Application Range: 12V Gasoline vehicles car spark plugs Plug Type: US Plug, it applies to Canada, , Mexico, Thailand, Taiwan, the , the Philippines and so on. Plug Type :EU Plug,it applies to Indonesia, , , , Italy and so on. Colour:As Shown Material:plastic Package Contents: 1 x Auto spark plug tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.