Detector Tube, Measurement Range 5 to 23 Percent vol, Gas Detected Oxygen, For Use With Mfr. No. 6400000, Color Change Blue Black to White, Operating Pressure 1,013 hPa, Operating Temperature – Minimum 41 Degrees F, Tube Material Glass, Break-Off Tip Yes, Calibrated Yes, Product Type Gas Detection Tube, Shelf Life 2 yr, Application Civil Defense, Fire Brigades, Industrial Applications, Military, Includes Instructions, Sampling Time 1 min (5 to 23 Percent vol), Chemical Formula O2