AUTOOL SPT101 Car Spark Plug Tester with Auto Adjustable Double Hole Detector Ignition Plug Analyzer 220V for 12V Vehicle Product Description AUTOOL SPT101 Car Spark Plug Tester is for testing the performance and strength of spark plugs. The product simulates actual engine conditions and works up to 6000rpm. It is compatible with all spark plug tests for crankshaft engines and motorcycles on the market. It can also test two holes at the same time and is designed with a protective cover to ensure the safe operation of maintenance personnel during the test. Notice Our products default 110V send flat plug, 220V send round plugIf you need different types of plugs, please contact me, otherwise we will send by default 3-YEAR WARRANTY For damage caused by non-human factors, AUTOOL promise to resend parts for free within 3 years. For any needs, you are warmly welcomed to contact us and we will get back to you ASAP within 24 hours. Easy to Operate Step 1: Place the spark plug in the test hole.Step 2: Cover the protective cover.Step 3Connect the power supply and adjust the working frequency .Step 4Observe the spark plug test status through the protective cover. 0 to 6000rpm Operating Frequency The AUTOOL SPT101 Car Spark Plug Tester is designed with adjustable working frequency, the range can reach 0 to 6000rpm. Can be adjusted as you required. Dual Hole Testing Time Saving The AUTOOL SPT101 Car Spark Plug Tester is able to dual-hole simultaneous testing as well as analog engine working, which is much more efficient and time-saving. Widely Application 12V Gasoline vehicles car spark plugs, 100V-240V input voltage . Packing List 1* AUTOOL SPT101 Car Spark Plug Tester main unit1* Packing box1* User manual1* Power supply connector