Check the listing for details. Car Spark Plug Tester Ignition Tester Spark Plug Analyzer Detector. Condition: New. Listed at 44.95 USD. Car Spark Plug Tester Ignition Tester Spark Plug Analyzer Detector. Feature: Performance: Car spark plug tester detector with two holes to test the spark plug. Function: The tester is used to test the spark plug and provides the right adjustment for the car. With dual hole, the tester can test and compare the two spark plugs. It can test spark plug performance and ignition strength. Wide Application: It can suit most cars. 12V Gasoline vehicles car spark plugs. Specification: Type: SPT101 Spark plug tester Model：12V Gasoline Car spark plug tester Color: Black, Yellow Material: Plastic, Metal Volt：12 Volt Analog speed：0-6000rpm Input: 100-240V AC Size: 145x85x110mm/5.71"x3.35"x4.33"(L*W*H) Power Supply: 110V/220V Power Adapter: Output DC 12V 1A Usage: Test car spark plug performance and ignition intensity Installation: Place the spark plug into the tester socket. Close up the protective cover, plug in the adapter to the side socket, connect the tester to the power supply. Open the yellow switch clockwise to turn on the tester. The indicator light power will light up, the tester is now working at 1000rpm/min. Continue to turn the yellow switch clockwise, you can adjust the working frequency between 1000rpm to 6000rpm/min. The higher frequency is set, the stronger the spark strength is. Easy to operate: Step 1: Place the spark plug in the test hole. Step 2: Cover the protective cover. Step 3：Connect the power supply and adjust the working frequency . Step 4：Observe the spark plug test status through the protective cover. Note: Please close the protective cover before testing. Package Include: 1 Pcs Spark Plug Tester 1 Pcs Power Adapter 1 Pcs User Manual