Detector Tube Measurement Range 1 to 100 ppm Gas Detected Hydrogen Fluoride For Use With Dosiholder Color Change Yellow to Purple 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 Shelf Life 3 yr Application Industrial Safety and Health Sampling Time 1 to 10 hr (1 to 100 ppm) Chemical Formula HF Operating Temperature - Maximum 104 Degrees F Package Quantity 10