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Apex Salinity probe versus refractometer?

@rygh do you have float switched in your setup in the sump as I have heard that cheep yellow wired eBay/Amazon float switches and other float switches when they get old they leak voltage into the tank and could cause issues with the conductivity probe....just a thought...
 
jonmos75 said:
@rygh do you have float switched in your setup in the sump as I have heard that cheep yellow wired eBay/Amazon float switches and other float switches when they get old they leak voltage into the tank and could cause issues with the conductivity probe....just a thought...
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I tested it by putting tank water in a small vial. No difference.
So not stray voltage.
 
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