| 摘要 |
A vacuum tester for the non-destructive testing of vacuum packages, particularly those provided in the packaging of meat and heat-and-serve products wherein one of the packaging members is a flexible member such as film. This tester includes a viewing chamber having a selective control means disposed to bring the chamber to a reduced pressure such as 28 or 30 inches of mercury. The closed chamber is brought under vacuum which is gradually increased until the flexible member enclosing the product just starts to relax at which point the selective control means is manipulated to maintain this vacuum level and at this stabilized pressure a gauge is read to determine the degree of vacuum within the chamber which is also the vacuum within the package.
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