I purchased a 3 year old PM2 module and salinity probe from someone off the forums. I went through all the steps on the controller to enable it but still get a zero reading for conductivity. Do these probes just die and give a zero reading? I would have expected maybe they become less accurate but not to the point of zero?
I haven't calibrated it yet, have the solution on the way for that. Still will calibration get me from zero to correct?
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