about the refractometer how to caliberate?

[JTMAMU]

Hi,

I got my refractometer from premium aquatics, but I wanted to know to caliberate it said to use distilled water, is it alright to use ro/di water to caliberate it?

thanks

[Jeremy B.]

Yes, no problem at all using your RO water.

[jun_celis]

You can use either one! Have fun with your new toy...