I got this refractometer from drsfostersmith.com, it was on sale and I have been wanting one. Anyways I was reading how to calibrate it and it says I need distilled water. Can I use tap or bottled or does it have to be distilled. Just wondering before I go running out to the store to buy a jug of distilled water for just a few drops.
http://www.drsfostersmith.com/Produ...fractometers&ref=3969&subref=AA&N=2004+113761
http://www.drsfostersmith.com/Produ...fractometers&ref=3969&subref=AA&N=2004+113761