I picked up an ebay refractometer (I know, some of you might be already shaking your heads). It is listed as a salinity refractometer, and has a built in SG scale to 1.070.
Problem is, I am not getting the right readings from it. a SG of 1.020 (measured by my hydrometer) is 1.035, and an SG of 1.040 is 1.065, even after multiple calibrations with distilled water.
I was under the assumption (correct me if I'm wrong) that SG is SG, no matter if its for salinity, sugar, or whatever.
I have the option to return it, but has anyone out there had a similar experience?