The Thexton THX404 TESTER IGN SPARK ADJ is a 4-channel spark tester that is designed to test ignitions and spark plugs This tester has a built-in spark gap tester, a spark timing tester, and a spark plug checker The Thexton THX404 TESTER IGN SPARK ADJ is also equipped with a digital display and a backlight for easy reading in low-light conditions

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