Pre-Cleaned Copper Tubing - 50 ft x 0.125 in O.D. x 0.065 in I.D.

Full NIST traceability using established EPA and ASTM protocols by using the appropriate combination of permeation devices. The permeation tubes are certified to be permeating at a certain weigh and threshold (~+/– 2%). Uncertified tubes have an estimated rate and a very large threshold, up to + /– 25%.