The lid part and the base part are in addition designed with elastic properties so that the pressure with which the bearing surface presses onto the test layer package is substantially constant in the tolerance range of {HEAD ~ the thickness} of {TAIL ~ the test field package}  
The lid part and the base part are in addition designed with elastic properties so that the pressure with which the bearing surface presses onto the test layer package is substantially constant in the tolerance range of { HEAD ~ the thickness } of { TAIL ~ the test field package }
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