Detector Tube Measurement Range 1.25 to 200 ppm Gas Detected Sulphur Dioxide For Use With Gastec Pump Color Change Blue 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 45 sec (5 to 100 ppm) Sampling Volume 100 mL (1 Pump Stroke) Chemical Formula SO2