I got a refractometer for Christmas and have been going crazy trying to trust the readings. I have the Pinpoint 35ppt salinity solution that I use to calibrate it before each test. I noticed that if I don't thoroughly rinse the lens and cover with clean (no salt) water and then dry with a paper towel it will give me odd readings. Is this what you guys do as well (clean the lens with water)? or do you just wipe it off with a dry towel or something? I'm very paranoid about getting bad readings...
The instructions just say to wipe off the lens between uses. I have this one:
http://www.drsfostersmith.com/Produc...fm?pcatid=9957