Disclaimer: I'm in no way affiliated with eBay nor the seller of the 6 bar watch case water proof tester.
I'm sure anyone reading this has looked up the Bergeon 5555 and thought... I can get a couple of Sumo's or even a Tuna for that price. Bergeon makes good stuff, and I'm sure it's worth it. My 6767 tool is indispensable and nothing beats the quality of a Bergeon tool.
Having said that, I'm a desk diver. Dive watches are my thing. I have 4 Seamasters, a GSAR, CWC, and some other watches (Vostoks, etc...). 2 of my Seamasters are quartz, so that means I've opened the case back to replace the battery more than once.
Since I don't really dive, I just want to know that I can take my watches into a swimming pool or boogie boarding, etc. I also buy pre-owned watches, so I'd like to know that they are water tight enough for my needs.
After loosing the bid for a really beat up Bergeon 5555, I decided to buy one of the Chinese 6 bar watch case testers floating around on eBay.
Surprisingly, it arrived in 7 days. I'm sure it's a fluke. I've ordered stuff from China that took a month to get to me.
Anyway, it was packed very well. The box itself was wrapped in foam and every space inside the box was filled with foam. The unit seems very nicely and solidly built. No sharp edges or any other tell-tale signs of shoddy workmanship. Here it is:

I'm going to be testing my classic Sub, so I filled the unit up with RO water and removed the watchband, leaving one spring bar:

Here's the Sub dangling on the holder:

All buttoned up and ready for testing:

I actually tested the watch with low pressure first just to make sure I'm not going to ruin my watch (~2 bar). After I was reasonably sure I didn't make a mistake equaling the magnitude of a used car, I went for the maximum pressure rating of the unit. I pumped the unit beyond 6 bar (using the red scale going up to 0.6MPa).

I let everything sit for about 5 minutes. Then I pushed the plunger down to bring the watch head into the water. Note that this plunger wants to go shooting back up because the system is under pressure. There is a locking mechanism on the plunger rod. Just push it down beyond the notch in the lid and turn it so that the pip holds the plunger down:

I once again left it sitting for a few minutes. I tapped on the whole contraption to get the random bubbles to come up (from the bezel, lug holes, etc). Then I released some pressure using the valve on top of the lid to get it to 6 bar:

The basic principle of operation is that if the watch had a leak, pressurizing the chamber while being hung in the air will pressurize the inside of the watch case. Then when dipped in the water and relieving some pressure in the "headspace", the air inside the watch case would have a higher pressure and want to escape. Since the watch is inside the water, the escaping air will appear in the form of bubbles (streaming out of the area where it is leaking).
Looked all around and no streaming bubbles:
\

I released some more pressure from the apparatus and still no bubbles. I took my time and was really careful.
Success!!! I can continue to desk dive in confidence.
I'm sure anyone reading this has looked up the Bergeon 5555 and thought... I can get a couple of Sumo's or even a Tuna for that price. Bergeon makes good stuff, and I'm sure it's worth it. My 6767 tool is indispensable and nothing beats the quality of a Bergeon tool.
Having said that, I'm a desk diver. Dive watches are my thing. I have 4 Seamasters, a GSAR, CWC, and some other watches (Vostoks, etc...). 2 of my Seamasters are quartz, so that means I've opened the case back to replace the battery more than once.
Since I don't really dive, I just want to know that I can take my watches into a swimming pool or boogie boarding, etc. I also buy pre-owned watches, so I'd like to know that they are water tight enough for my needs.
After loosing the bid for a really beat up Bergeon 5555, I decided to buy one of the Chinese 6 bar watch case testers floating around on eBay.
Surprisingly, it arrived in 7 days. I'm sure it's a fluke. I've ordered stuff from China that took a month to get to me.
Anyway, it was packed very well. The box itself was wrapped in foam and every space inside the box was filled with foam. The unit seems very nicely and solidly built. No sharp edges or any other tell-tale signs of shoddy workmanship. Here it is:

I'm going to be testing my classic Sub, so I filled the unit up with RO water and removed the watchband, leaving one spring bar:

Here's the Sub dangling on the holder:

All buttoned up and ready for testing:

I actually tested the watch with low pressure first just to make sure I'm not going to ruin my watch (~2 bar). After I was reasonably sure I didn't make a mistake equaling the magnitude of a used car, I went for the maximum pressure rating of the unit. I pumped the unit beyond 6 bar (using the red scale going up to 0.6MPa).

I let everything sit for about 5 minutes. Then I pushed the plunger down to bring the watch head into the water. Note that this plunger wants to go shooting back up because the system is under pressure. There is a locking mechanism on the plunger rod. Just push it down beyond the notch in the lid and turn it so that the pip holds the plunger down:

I once again left it sitting for a few minutes. I tapped on the whole contraption to get the random bubbles to come up (from the bezel, lug holes, etc). Then I released some pressure using the valve on top of the lid to get it to 6 bar:

The basic principle of operation is that if the watch had a leak, pressurizing the chamber while being hung in the air will pressurize the inside of the watch case. Then when dipped in the water and relieving some pressure in the "headspace", the air inside the watch case would have a higher pressure and want to escape. Since the watch is inside the water, the escaping air will appear in the form of bubbles (streaming out of the area where it is leaking).
Looked all around and no streaming bubbles:


I released some more pressure from the apparatus and still no bubbles. I took my time and was really careful.
Success!!! I can continue to desk dive in confidence.