Detector Tube, Measurement Range 10 to 250 ppm, Gas Detected Carbon Monoxide, For Use With Mfr. No. NX-1000-100, Mfr. No. NX-1000-130, Mfr. No. NX-1000-150, Mfr. No. NX-1000-200, Mfr. No. NX-1000-230, Mfr. No. NX-1000-250, Tube Material Glass, Break-Off Tip Yes, Calibrated Yes, Product Type Gas Detection Tube, Sampling Method With Pump, Shelf Life 2 yr, Application Atmospheric Pollution Survey, Blast Furnace, Combustion of Coal Gas, Garage, Parking Garage, Tunnels, Chemical Formula CO