Detector Tube Measurement Range 1 to 80 ppm Gas Detected Acid For Use With Gastec Pump Color Change Pale Bluish Purple to Yellow 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 2 yr Application Industrial Safety and Health Sampling Time 1 min (2 to 40 ppm) Sampling Volume 200 mL (2 Pump Stroke)