Ark and DLD are the experts but I have read and personal testing kinda confirmed:
Normal BM -10 to -12Hg
Extreme/Vac adapter -15Hg
I just trust vac pumping with a gage way more but still use hot water in the tube. Just a personal preference.
As the penis increases in size, and expands you will notice as a user being able to compress small volumes of water from the device top. What this is indicating, is that the volume inside the bathmate chamber has been forced to expand, with your larger penis size being that volume amount of water removed from the top
I have no idea what the actual hg is, but I believe the beauty of hydro-pumping is that fact that water has a greater density than air thus able to impart more force evenly
Yeah but did you understand what I quoted? even with more powerful mods to a hydro pump, you cannot rush the pressure until that water has been displaced due to increase in penis size hence why it is said to be safer versus air pumping.