Detector Tube Measurement Range 100 to 4 000 ppm Gas Detected Carbon Dioxide For Use With Gastec Pump Color Change Pale Orange Red to Orange 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 2 min (100 to 2 000 ppm) Sampling Volume 100 mL (1 Pump Stroke)