Quote:
Originally Posted by Aqua-Digital
a prism refractometer is only as accurate as its calibration (same as a digital unit) however there is no risk of human miss read error with digital.
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Exactly however unlike other testing equipment refractrometers don't require the hopeless attempt of matching a color to another set that all look the same
So digital kits like Hanna are quite valuable and are not overly more expensive. A typical refractometer costs around $60 and IMO are easy to read, the difference between blue and white is noticeable and the line is very defined. So the question is how much more does one have to pay to eliminate the so called difficult task of reading a refractometer?