Well, I've only got 28 years of experience. Practically a newb!Ill take the advice of reefers with 40+ years experience and multiple sites on the internet saying the same thing of distilled water but thanks for your opinion
A: To calibrate a saltwater refractometer, you should first fill it with distilled water. You then need to set the desired range for your refractometer on the side of the device. Once this is done, you can start measuring salinity levels in your sample. How do you use a refractometer in a marine tank?
Also, you don't fill a refractometer. Do these experts you rely on have some new tester?