Neptune PM2 Conductivity Probe options

[septicdeath]

Am I locked into Neptune's probes for this? Or does anyone know if any of the other ones other there can be used? Per my other post, my salinity/conductivity probe can change 3-4ppt by simply "swishing" it around in my sump (probe is under 60 days old). I could understand it working and slowly drifting as it gets dirty, but this can happen in a matter of a week, my luck with neptune customer service hasn't been the most pleasant recently, so Im willing to just buy another company's probe if someone would direct me to one that will work with it.

Thanks in advance.