Detector Tube, Measurement Range 0.2 to 2 Percent vol, Gas Detected Hydrogen Acid, For Use With Mfr. No. 6400000, Color Change Green Yellow to Turquoise Blue, Operating Pressure 1,013 hPa, Operating Temperature – Minimum 68 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 (0.2 to 2 Percent vol)