I just tried the calibration fluids that came with the GHL and the Pinpoint and this is what my refractometer measured.
GHL 50mS @ 25 degrees: 1.018
Pinpoint 53.0mS @ 25 degrees: 1.028
Makes no sense to me. Perhaps the calibration fluids are contaminated or old?
Contamination seems unlikely as both of the bottles have never been left open and are under 30 days old from both manufacturers (store purchased).
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