Calibration of Refractometer Question for a newb.

[Stump48]

So I have been calibrating my refractometer with my RODI water before I measure the tank. When I do this I line it up to the line off to the right side which it says to do. However, when I have notice that the light line is above the sg 1.0 and 0 ppt measurement. Is this normal? I just want to make sure I am getting the right reading for my tank.

 

[fishguy242]

hi, there is a calibration solution for them,i have just used rodi for decades,and just go to 0 ppt,seems to be fine,or close enough and
welcome to the reef going to love it here!!
lots of fun/info/fun/help/fun....

 

[PatW]

You can buy a standard solution for calibrating refractometers. Mine is 35 ppt. I put it in and if the refractometer does not read 35 pt, I adjust it so it does. A bottle of the stuff will last quite some time.

 

[Billldg]

I agree with above, I have always just used the calibration fluid that usually came with it to calibrate it.

 

[h2so4hurts]

Calibrating to 0 isn't a great idea. You can get calibration solution for like $10 and it will last a crazy long time.

 

[Stump48]

Thanks, that is pretty much what I have been doing but the line off to the right always threw me off. I'll defiantly look into the calibration solution. Thank you for the info.