Make this draft beer carbonation tester part of your draft beer equipment arsenal and you'll always have the ability to field-test and verify appropriate carbonation levels. Use it during draft system installations, keg changes, or while troubleshooting. * Don't just hope that your beer is properly carbonated. Get this professional beer carbonation tester and be absolutely sure. * Specs - Canister Capacity: 4.5 oz. * Includes - (1) Taprite draft beer carbonation tester, (1) Protective carrying case, and Detailed operating instructions.