Conductivity calibration

[Astolfo]

:mad:I am trying to calibrate my conductivity probe, but I can’t find the 3.9 mS/cm solution anywhere, in reasonable amounts. Any alternative, or ingenious way to do this?
and i need to get my aquarium water under control after moving.
thank you

[Chicago Discus]

Check foster and smith.....Josie

[TNT77]

http://www.eseasongear.com/caso.html might find what you need there.

[Astolfo]

F&S does not have it and i can't find it on the other link...i will call them tomorrow.