It seems like most of the refractometers on the market these days have tiny little scales and I find them hard to read. The Vertex is a prime example. Who makes ones with bigger scales? I have an old "Link" that is awesome to read.
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I looked in the manual! What the heck?? I'll go look again!Red Sea lists the accuracy. I found it in the link you posted. Download the manual.
Hi Mindy - i only had this myself for a couple of days but maybe of interest to you
AquaMedic Salimeter
Dialed in at 25C/77F accuracy 0.0005