Detector Tube Measurement Range 0.5 to 32 mg/L Gas Detected Water Vapor For Use With Gastec Pump Color Change Yellowish Green to Purple 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 3 yr Application Industrial Safety and Health Sampling Time 45 min (1 to 18 mg/L) Sampling Volume 100 mL (1 Pump Stroke) Chemical Formula H2O