Detector Tube, Measurement Range 0.05 to 4 Percent, Gas Detected Acetylene, 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 45 min (0.1 to 2 Percent vol), Sampling Volume 100 mL (1 Pump Stroke), Chemical Formula C2H2