1. Please wear gloves and goggles when use.
2. This 9pcs professional gas engine cylinder compression test tool should be used by professional or under the guidance of a professional.
3. Always refer to the vehicle manufacturers service instructions, or a proprietary manual, to establish the current procedure and data.
4. Always release the pressure via the release valve before disconnecting the tester.
5. Set the throttle plates to the wide open position when test. Please note, after test, failure to return the throttle plates to the closed position before starting the engine can cause serious damage to the engine.
6. After insert the quick plug into the quick coupler, push the anti-slip knurled grip ring on the quick coupler back.