Detector Tube, Measurement Range 2 to 15 mg/m3, Gas Detected Cyanide, For Use With Mfr. No. 6400000, Color Change Yellow to Red, 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 6 mo, Application Civil Defense, Fire Brigades, Industrial Applications, Military, Includes Instructions, Sampling Time 2.5 min (2 to 15 mg/m3), Chemical Formula CN-