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Mass spectrometry analysis of electronic components is more than an Internal Water Vapor test as the titles of the Military Standards 883 and 750 might imply. The test provides a quantitative measurement of all gases inside a device and should be used as such. To ignore the other gases is like throwing away a winning ticket to lottery. The other gases matter. The other gases are relevant indicators of sealing quality and potential product reliability issues. Because the test measures all of the gases, the test method provides the only way to evaluate the quality of sealing processes. It provides the only way to conclusively identify out-of-control sealing batches. Because it measures all of the gases, the method is best used as a tool to develop sealing processes and then monitor sealing processes. Only then can it be effective as a qualification tool.