Calibration Traps are required for proper operation of the instrument. Calibration Traps are produced under strict laboratory controls and are engineered using the highest quality Teflon®-coated (PTFE) fiberglass material available. Calibration Traps meet the exact standards required for precise calibration of your instrument. Traps are packaged in contaminant-free recyclable trays and sealed for maximum freshness and longevity.