W3/062, also Water Vapor Permeability Tester, is based on cup method (Gravimetric Method) to measure WVTR of plastic films and finished packages. It has Six independent testing cells.
W3/031 Water Vapor Permeability Tester is based on Gravimetric Method for water vapor permeability test of film specimens. It is based on ASTM E96 and has three individual test dishes.