Detector Tube Measurement Range 3 to 24 Percent Gas Detected Oxygen For Use With Gastec Pump Color Change Black to White 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 3 yr Application Industrial Safety and Health Sampling Time 30 sec (6 to 24 Percent vol) Sampling Volume 50 mL (1/2 Pump Stroke) Chemical Formula O2