Detector Tube, Measurement Range 0.1 to 40 ppm, Gas Detected Formaldehyde, For Use With Gastec Pump, Color Change Yellow to Reddish Brown, Operating Pressure 912 to 1,114 hPa, Operating Temperature - Minimum 32 Degrees F, Tube Material Glass, Break-Off Tip Yes, Calibrated Yes, Product Type Gas Detection Tube, Sampling Method With Pump, Shelf Life 3 yr, Application Industrial Safety and Health, Sampling Time 7.5 min (0.1 to 5 ppm), Sampling Volume 500 mL (5 Pump Stroke), Chemical Formula CH2O