First - New update? Could you be more specific? The most recent AOS update, 5.03, was withdrawn a couple of days ago due to problems. It shouldn't be available right now. Is that the one you mean, or something else?
Second - You may want to recalibrate your conductivity probe. If you don't have anymore standard solution, you'll have to buy some, this is the right stuff:
https://www.bulkreefsupply.com/pinpo...ion-fluid.html
Third - You'll probably find that, after a while (weeks, months), this probe starts to vary its reading during the day. Sometimes, by a surprising amount. The salinity in your tank won't actually be changing minute to minute the way the probe will suggest that it is. Tiny bubbles of air/gas may build up in the probe which can change the reading significantly. You may find that just swishing the probe around will sometimes change the reading immediately. Also, don't forget that the probe isn't measuring actual salinity, it's measuring conductivity and then translating that to salinity in software, which introduces another potential source of error. Imo, of the 4 probes that come with the Apex, this one is the least consistent.
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