In BusinessSince 1987
CA, FL, GA, ID, IA, IN, MA, MD, MI, MO, NC, ND, NE, NY, OH, TX, WI
Simply adjust calibration screw to proper gap size. Attach spark plug wire to end of tester. Clamp tester on engine to ground. Crank engine and check for spark.
Skin-packed. Shipping wt. 3 oz.