Peter, I went through the same analysis as you did. Four thousand psi still gives me approx. a dozen bottle fills, which is plenty for me at $9 per tank fill. I just got tired of dealing with the dive shop. It really wasn't interested in keeping me happy because I'm not a diver. The service was marginal, at best. I am so much more happy with my own compressor. I can keep tabs on quality control, and my $600 tank is not in some storeroom overnight with Lord knows what kind of security. Further, I've seen the way the staff of some of these dive shops handle tanks; I'm not a fan :-(
If you want to check the pressure on your tank, get a deadhead. It is simply a plug that quick-connects to the female Foster fitting on the end of your tank hose. With the deadhead connected, you can simply open your tank valve to read the pressure on the tank gauge. I got mine from AIRHOG (https://www.airhog.com/index.php)
If you want to check the pressure on your tank, get a deadhead. It is simply a plug that quick-connects to the female Foster fitting on the end of your tank hose. With the deadhead connected, you can simply open your tank valve to read the pressure on the tank gauge. I got mine from AIRHOG (https://www.airhog.com/index.php)
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