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So I managed to get a more accurate reading (I think).
As I didn't have any calibration liquid on hand I simply used my tank water as a 50mS calibration.
I know it isn't exact, however I suspect I can now use the value for trending (is it more/less or stable). I will test this tonight by removing the probe and putting in some RODI water - hopefully it drops.
I still can't get the display to be in specific gravity - anyone know if this is available in firmware 6.37?
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