Which Watch Waterproof Tester Tool should I choose?

[nohappy]

I'm looking for a watch waterproof tester tool to test dive computer. When I looked up online, there are two similar device but with big price difference. Does anyone know what the difference is and which one should I choose?
This one is $129
Amazon.com: Solid Watch Waterproof Tester, Watch Waterproof Tester Tool for Watches 6 ATM Watch Case Resistant Air Pressure 0.3~6.0 bar Commercial and Home Use, Ship from USA Warehouse: Home Improvement

And this one is $799
Bergeon 5555/98 Watchmakers Waterproof Watch Tester

 

[rhwestfall]

search here on SB for Pressure Pot - folks are making them with water filter housings, hand pump, and a gauge for a whole bunch less.

 

[tridacna]

First one is fine. Make sure that your computer fits comfortably inside. They’re only intended for watch style dive computers. They’re both small. I use rubber bands to tie them to the hang-bar. The water level is also critical with these devices.

Principle is simple. Pump up pot to working pressure then dip computer into the water. If you see significant bubbles emitting from the computer, there could be a problem.