I check accuracy every 2 weeks and if needed calibrate. I think this is all based on the reliability of your instrument if it is a pricey one chances are it stays calibrated for quite a while. Mine is cheapo so I calibrate and check it regularly as it is not the best instrument.
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"To a man with a hammer, everything looks like a nail," - Mark Twain
55 Gallon Reef Tank
Location: Tucson, Arizona
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