Lately I feel a bit cursed. Have been using a digital salinity probe and come to find that it is 4 ppt off and my salinity was close to 40ppt! So I tried to calibrate it and it doesn't seem to hold a calibration. I had my friend a mechanical engineer try too, no luck.
Then I buy a refractometer. Using RO water to calibrate, I can't turn the screw to zero it out, won't turn any more. My RO water was tested at zero TDS but I haven't tested it recently. I'll go buy some distilled water to test refractometer but if that doesn't work, any other ideas or send it back? Is this common with these? Faulty I mean?
Thank you for any guidance.
Then I buy a refractometer. Using RO water to calibrate, I can't turn the screw to zero it out, won't turn any more. My RO water was tested at zero TDS but I haven't tested it recently. I'll go buy some distilled water to test refractometer but if that doesn't work, any other ideas or send it back? Is this common with these? Faulty I mean?
Thank you for any guidance.