Detector Tube, Measurement Range 100 to 4,000 ppm, Gas Detected Diethyl Ether, For Use With Mfr. No. 6400000, Color Change Orange to Green Brown, Operating Pressure 1,013 hPa, Operating Temperature – Minimum 59 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 3 min (100 to 4,000 ppm), Chemical Formula (C2H5)2O