Refractometer calibration solution

[AJsTank]

I know for a fact my calibration solution is wrong.

So tell me this. Am I okay calibrating my refractometer to zero with RODI water?

 

[Pete polyp]

Yep. Just have to use the conversion. 1.025 will read 1.0265 or something. You vegan google it and find the exact equation.

 

[redfishbluefish]

For the greatest accuracy you're best using the proper calibration solution...53.0 mS Calibration Fluid.

 

[Pete polyp]

Even though the largest percentage of salt in the sea is sodium chloride, the presence of other significant ions such as magnesium and calcium in NSW results in a different refractive index to that of brine. A standard (brine) refractometer will therefore not give the correct salinity for NSW and a conversion factor must be applied.*For example, a 35 ppt (parts per thousand) solution of NSW has the same refractive index as a 36.5 ppt solution of brine. When using a brine refractometer, an aquarium hobbyist should therefore look for a reading of 36.5 ppt when trying to achieve a reading of 35 ppt for NSW.*

 

[Pete polyp]

http://reefkeeping.com/issues/2006-12/rhf/

This is a great write up

 

[AJsTank]

Thanks for the link