I am sorry to disagree, but a Base-exchange softened water should have the same conductivity as the water feeding it.  If the conductivity is higher, then the usual cause is salt, which is used to regenerate the resin, is present in the water and indicates over-brining or poor backwash.  There are simple tests for hardness where a volume of water is poured into a plastic container and a tablet is dropped into the water.  A lid is put on and shaken.  If the water is blue or green the unit is providing soft water while if it is red it is failing to provide soft water.

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I am sorry to disagree, but a Base-exchange softened water should have the same conductivity as the water feeding it.  If the conductivity is higher, then the usual cause is salt, which is used to regenerate the resin, is present in the water and indicates over-brining or poor backwash.  There are simple tests for hardness where a volume of water is poured into a plastic container and a tablet is dropped into the water.  A lid is put on and shaken.  If the water is blue or green the unit is providing soft water while if it is red it is failing to provide soft water.