Detector Tube Measurement Range 0.1 to 65 ppm Gas Detected Benzene For Use With Gastec Pump Color Change White to Dark Green 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 10 min (0.1 to 10 ppm) Sampling Volume 500 mL (5 Pump Stroke) Chemical Formula C6H6