Calibrating refractometer for hypo

[cmcoker]

Hey Randy, I am pretty sure I asked you this before, but there is quite the debate going on here https://www.reef2reef.com/index.php?threads/247596/

So for calibration, usually a 35ppt solution is recommended to account for slope errors.
However if testing for hyposalinity, 1.009,
Using distilled or rodi would be better, right? Since the value we are concerned about is closer to 0.

Thanks

 

[Randy Holmes-Farley Verified Community Expert]

I posted there [emoji3]