Originally posted by Cate&Rob
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Every measurement device requires calibration/confirmation of some sort. You need to know the device, whatever it is measuring, is measuring correctly against a known quantity to have faith in it.
Cate&Rob Edit. I better understand what you said Rob. There are no electronics etc to confirm operation. Just a lump of glass. So I understand now what you meant by 'needs no calibration'
All the refractometers I had used in the past had heaters and digital displays.
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