Detector Tube, Measurement Range Qualitative, Gas Detected Acid, For Use With Mfr. No. 6400000, Color Change Blue Violet to Yellow/Pink Yellow, Operating Pressure 1,013 hPa, Operating Temperature – Minimum 32 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 sec, Chemical Formula HCl