Detector Tube Measurement Range 1 to 36 ppm Gas Detected Methyl Bromide For Use With Gastec Pump Color Change White 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 3 yr Application Industrial Safety and Health Sampling Time 3 min (1 to 18 ppm) Sampling Volume 200 mL (2 Pump Stroke) Chemical Formula CH3Br