Detector Tube Measurement Range 0.1 to 4 Percent Gas Detected Hydrogen Sulphide For Use With Gastec Pump Color Change Pale Blue to Blackish 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 Sampling Method With Pump Shelf Life 3 yr Application Industrial Safety and Health Sampling Time 45 min (0.1 to 2 Percent vol) Sampling Volume 100 mL (1 Pump Stroke)