PAC CHECK 450. Benchtop 02. Headspace analyzers are imperative for accurate shelf-life testing of finished packages, including CAP/MAP (Controlled Atmosphere Packaging/Modified Atmosphere Packaging) and vacuum-packed products. Sample testing is necessary, as the atmosphere in a package cannot be strictly and indefinitely controlled, only modified. The PAC CHECK Systems are used in production, quality control and R&D applications. The PAC CHECK 450 measures O2 concentration with small sample amounts, manually or automatically. The same analyzer can be used for both flexible and rigid packaging.