ChemLogic® colorimetric cassettes offer extremely quick and reliable detection for an extensive list of gases. Shop our available tapes above, or, if you need a full detectable gas list please contact us today! These tapes are for the ChemLogic® 1 and ChemLogic® 2 continuous gas detection devices. Switch between gases with a change of tape, no gas keys are required. DOD Technologies ships tapes with a minimum of 8 months of life remaining. You can store our tapes in a freezer and use them when you need to.