http://forum.aquariumcomputer.com/sh...-drifting-down

i read this topic and cross post also here...

GHL staff can you tell me if maybe also conductivity probe can suffer of interferences or miss calibration??

yesterday i re-calibrate again at show 34.5 (like a rifractometer perfect calibrated with FM-reference solution.

today nothing change in tank and sump and again 34.1 ... i bet that this evening i will read under 34 PSU.. why happen?