Features 1. The dual hole car spark plug tester detector has two test holes, and you can test both spark plugs at the same time. If you suspect that any spark plugs are not working properly, you can compare and test them to make accurate judgments. 2. Used to test the performances and ignition strength of spark plugs, suitable for 12V gasoline vehicle spark plugs. 3. Adjustable dual hole automotive spark plug tester, tester, ignition plug analyzer, diagnostic tool. 4. Purpose: To test the performances and ignition strength of spark plugs. 5. Application scope: 12V gasoline car spark plugs. Specification Power adapter: Input 100-240V AC/Output 12V 1A DC Material: ABS Color: Black Size: 16 x 10 x 5 cm Weight: 400 g Package Include: 1pc x Spark Plug Tester 1pc x Power Adapter