Detector Tube Measurement Range 0.25 to 120 ppm Gas Detected Hydrogen Sulphide For Use With Gastec Pump Color Change White 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 Sampling Method With Pump Shelf Life 3 yr Application Industrial Safety and Health Sampling Time 1 min (2.5 to 60 ppm) Sampling Volume 100 mL (1 Pump Stroke) Chemical Formula H2S