Pressure gauge mounted in bottle cap

Catt22 said:

Because it would be very difficult to take a reading without relieving some or all of the pressure using a tire gauge. I'm not convinced that there would be an advantage to using this method. The pressure in the head space will build up relatively quickly, but it takes some additional time for the gas to diffuse throughout the beer. My point is that a pressure reading alone may not accurately reflect the carb level of the beer. I do agree that it would be interesting to try just for fun.

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