The new, easy to use, PERMATRAN-W Model 398 is the latest water vapor transmission rate system in a long line of quality systems available from MOCON, the World Leader in permeation technology. This simple, low maintenance system conforms to the new ASTM Standard E-398 and produces the accurate and reliable data the industry has come to expect only from MOCON. The low-cost Model 398 is designed for medium to high barriers and allows for two films to be tested independently. Each test cell has its own sensor, assuring greater throughput with accurate results. Because the Model 398 provides for precise relative humidity testing, two films may be tested simultaneously at two different RH conditions! The WinPerm™, Windows® based software, is simple and intuitive. Automated temperature and relative humidity control, as well as automatically determined equilibrium, all but eliminate operator error.