digital vs naked eye you decide

[Aqua-Digital]

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.