I have 3 devices I use to measure salinity, a refractometer, a Hanna HI98319 salinity tester and a Pinpoint Salinity Monitor. I have acquired these 3 devices in my quest to find the most accurate salinity measurement.
My problem is that the Hanna and Pinpoint testers measure 0.02 sg less than my refractometer. For example, the Hanna/Pinpoint will measure 1.025 and the refractometer measures 1.027 sg.
All three devices have been calibrated multiple times, over the years, with their respective manufacturer calibration fluids. So I'm baffled as to why they're so far off from each other.
Any insights would be greatly appreciated.
My problem is that the Hanna and Pinpoint testers measure 0.02 sg less than my refractometer. For example, the Hanna/Pinpoint will measure 1.025 and the refractometer measures 1.027 sg.
All three devices have been calibrated multiple times, over the years, with their respective manufacturer calibration fluids. So I'm baffled as to why they're so far off from each other.
Any insights would be greatly appreciated.