Checks for bends, twist and offset in less than a minute. Checks rods with or with out pistons-with or without caps. Compensated for ring lands, cam-ground & tapered pistons. Check is made against a precision-ground surface, on a stress-relived casting. Self-aligning yoke clamps rods securely and square, including miter cut for forgings. Handles rods-from 1¾" diameter passenger car, 3" diameter truck, bus and tractor rods-up to 16½". Weight 45 lbs.