How much do small PSI gauges cost and a fitting which could be sealed into a plastic beer bottle cap?
Call me a geek, but I'd love to see what PSI bottles get to during carbonation.
Call me a geek, too. (answer: about $15).
https://www.homebrewtalk.com/f51/pressure-gauge-mounted-bottle-cap-268151/
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You sir, are a geek, and a magnificent b@##$@d. It looks like its at 4 psi - did it stay there the whole time?