Detector Tube Measurement Range 0.05 to 1 ppm Gas Detected Formaldehyde For Use With Gastec Pump Color Change Yellowish Brown to Pale Pink Operating Pressure 912 to 1 114 hPa Operating Temperature - Minimum 50 Degrees F Tube Material Glass Break-Off Tip Yes Calibrated Yes Product Type Gas Detection Tube Sampling Method With Pump Shelf Life 1 yr Application Industrial Safety and Health Sampling Time 7.5 min (05 to 1 ppm) Sampling Volume 500 mL (5 Pump Stroke) Chemical Formula CH2O