Detector Tube Measurement Range 1 to 30 ppm Gas Detected Carbon Monoxide For Use With Gastec Pump Color Change White to Pale Pink 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 4 min (1 to 30 ppm) Sampling Volume 100 mL (1 Pump Stroke) Chemical Formula CO