Logging the bubble frequency in your airlock

Leave it to a geek who loves beer to come up with this one.

One of the folks over at Hack-a-day created a device to measure the frequency of bubbles in his airlock by measuring the passage of air through the air lock.  They say the system breaks down during vigorous fermentation, but for later on in fermentation or in secondary fermentation this could tell you when your beer is close to being done.

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