Spark Plug Tester, Automotive Dual Holes Spark Plug Tester Tool with Adjustable Dual Holes Ignition Tester and Protective Cover Spark Plug 0 to 6000rpm Adjustable for 12mm Spark Plug. Versatile Dual Holes Design: Our Spark Plug Tester features adjustable dual holes, allowing you to test 12mm spark plugs with precision and ease.
