Calibration fluid for Apex CONDx probe

[gobeach]

Any recommendations for calibration fluid? I did a search on Neptune Systems website and don't find the fluid. BRS has pinpoint fluid, but I don't know if that will work.

 

[strange33w]

im using the BRS fluid it work good as far as I know. My ph on the apex reads 7.8-7.9 most of the day and i used a reg test kit and it came in at 8.0 so pretty close.