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Digital thermometer recommendations please

Yes hospitals and labs will be calibrated as accuracy and repeatability is key.

As for fish keeping, +-1 'C (or more will be fine), fish won't mind.

Personally I would stick with a liquid in glass thermometer designed for fish tank use. It will have been designed for limited tank water range, so liable to be more accurate than a general purpose large range thermometer (ie -20 to +90 for instance). Also big plus no batteries required, all adding to the KISS of fish keeping (Keep It Simple Stupid).
 
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