Maybe they can send me a new sleeve. There was a little glass on the floor. I did move it around the sump. With all brand new equipment I hope I don’t have stray voltage. I’ll see what they say. ThanksI think there is a glass sleeve inside the probe that probably broke. All the salinity electrodes consist of two platinum electrodes a specific distance apart from each other. The current flow between these two electrodes is what is measured to get the conductivity of the water. Basically the resistance of the water. The more salts and stuff the more conductive it is. Air bubbles accumulating on or between the electrodes, critters or other substances getting between the electrodes will affect the readings. Also any stray voltages in the water will also affect this reading. These issues will always be an issue with a conductivity probe. Changing where it is placed in the system may be all that is needed to get more consistent readings. That being said I would not use it to control anything. You never know when a air bubble will accumulate or some small critter will decide to hide up in the probe causing a reading shift.