The pressure gauge as such I think rather a gimmick,
also do not know if you really need this, because the vacuum by feeling, mood and feelings should be generated.
The bad reviews of some users (that may lead to testicular contusions and the like.)
I can not understand definitely.
Perhaps it is, in the cases only because the proportions are not right.
Overall, a good product, one star deduction there from me because of the pressure gauge IMA is a gimmick and
the pump, despite impressive external dimensions, for quite large built men is not sufficient.
Man (n) encounters, in the truest sense of the word, too early to the interior volume.