I'd like to use a PM2 to measure TDS in a freshwater tank. (I know, I'll need to convert from µS/cm to get a TDS number).
The PM2 manual says to use 6668 µS/cm calibration solution, but I can't find a source for it anywhere. I've looked at several chem supply houses, aquarium supply, Amazon... nada
Does this stuff actually exist? ;-) Any leads would be very welcome.
Thanks
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