| I have not had to re-cal mine since the first time nearly a year ago. I do check it, from time to time, against base water and even some known quantities from my other hobby of home wine making.
FWIW I was never able to get it to give the same reading as my two pendulum meters. Time has shown the pendulums were both wrong.
Tass
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"It is true that I forego the fruits of the land.
For I am gathering the flowers of the sea"
Admiral Carthwright, Royal Navy 1756
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