Carbon Dioxide (CO2) Gas Detector TubesDetection Range: 2.5-40% (10 tubes, 10 tests per box) Instrument Depot | (800) 731-7071 | *BUY NOW* Gastec Carbon Dioxide (CO2) Detector Tubes, Measuring Range: 2.5 - 40% P/N 2HH Material Safety Data Sheet (MSDS)