garyw68
03/31/2008, 03:26 PM
I have always calibratied my refractometer using ro/di water. I wanted to try the cal fluid so I order some on-line and just received it today. with the ro/di...i would always get a 0ppt reading. with the cal fluid...i am getting 36ppt...one unit off. Should i lower the reading to 35 with the cal fluid or stay where its at with a 0 using ro/di water?