The units use absolute vacuum transducers as well as high-resolution differential vacuum transducers.
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Inspecting blisters, pouches, vials, ampules and bags for leaks as small as 0.5 microns, the PH-325 leak tester from PTI (Tuckahoe, NY) self-teaches by measuring 5 to 10 samples from which they set and hone all the criteria.
The units use absolute vacuum transducers as well as high-resolution differential vacuum transducers.