A&E Hand Tools' TU-30A tests compression on all major gasoline vehicle platforms domestic and foreign, including motorcycles, mini engines, snowmobiles, outboard motors and more. Features new patent-pending Ford Triton engine compression adapter that fits both the M16 spark-plug port and the new, redesigned M12 spark-plug port. Adapters can be used on either flat or tapered spark-plug hole seats. Snap-fit blow-molded case offers convenient storage.