This is all good feedback, we always like to involve our target audience with product development, its a great barometer for us.
In regards to calibrating, I say everytime to ensure the best of readings even Hanna meters require this, and to be honest I would not even trust a refractometer unless it has been calibrated before hand, but thats personal choice.
A digital meter does not require pre use calibration its more a recommendation for optimum accuracy, just as with a refractometer and also the likes of hanna or pinpoint.
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