Detector Tube Measurement Range 0.4 to 400 ppm Gas Detected Carbon Monoxide For Use With Dosiholder Color Change Pale Yellow to Brown 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 Shelf Life 2 yr Application Industrial Safety and Health Sampling Time 0.5 to 24 hr (0.4 to 400 ppm) Chemical Formula CO Operating Temperature - Maximum 104 Degrees F