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A simple, portable system has been developed and tested for generating a known water–vapor content is selected permanent gases or gas mixtures. Parts‐per‐million values ranging from 250 to 20 000 are generated in a continuous flowing stream at flowrates ranging from 50 to 200 cm3/min. A known volume of the flowing gas can be selected to simulate the internal free volume and internal pressure of hermetically sealed packages as small as 0.04 cm3. By using a variety of available connectors, the selected volume of gas may be transferred into the inlet system of a mass spectrometer for water–vapor calibration. Generator stabilizing time and upper flowrate limits are given along with test results when compared to a Transfer Humidity Standard.