Performance Tool W80580 0-300 PSI Compression Tester: Automotive. Buy Performance Tool W80580 0-300 PSI Compression Tester: Spark Plug & Ignition Tools - ✓ FREE DELIVERY possible on eligible purchases. Fits all common spark plug holes 。 Large easy to read gauge 。 SAE (0 PSI to 300 PSI) and metric (1 to 21 kilograms/centimeter square) 。 Rubber tip 。 Color: black 。 Tapered rubber tip fits all common spark plug holes. Large easy to read gauge. Gauge is SAE (0 to 300 PSI) and metric (1 to 21 kilogram/centimeter square). 。 。 。