Combustion Leak Tester has a dual chamber unit which eliminates false positives and provides for a high accuracy test. The first chamber will filter out any alkaline particles that could result in a false indication of a combustion leak. Test results in the second chamber will provide a true indication of a combustion leak. Checks for head gasket leaks, cylinder head leaks and engine block leaks. Includes a foam lined storage case to protect the tester.