Calibrating Refractometer

[gregzz4]

Originally Posted by seasalt_newbies

what 45 sec instructions are you talking about ?

I have a bottle of Aqua Craft Products, and it states to "Place a few drops of Refractometer Calibration Solution on refractometer prism slide.
Allow 45 seconds if ATC refractometer is used."

My refractometer instructions state this time delay allows the solution to adjust to the ambient temp of the unit. But my unit and solution are kept in the same room - whatever
My instructions also state to cal the unit at 68F. Something to do with it being an ATC unit. Then it is accurate with an ambient shift of 10-30C
So I cal my unit in the basement as it's cooler down there than my 74F upstairs
To each his/her own ...