Salinity meters/hydrometers

[BlueAbyss]

I'll just be buying a refractometer to start off with, to alleviate any issues. I mean, for only 40 bucks, why not?

[Snaz]

Originally Posted by NAS

So, when I use it on a day to day basis i just add .03 to it and it's corrected.

That's how a calibrated glass hydrometer works. With a couple of known solutions measure the standard deviation and then apply that deviation to the observed reading.

So once you know your hydrometer consistently reads +.03, add that to the observed result for an accurate measurement.

Of course by measuring anything you are changing it so you can never have a "TRUE" 100% no questions asked result.