I like the Salinity probe, it does not accurately match my salinity, but it does show trends and if your ATO sticks on or your external skimmer overflows you can set a warning or even turn off the ATO. Redundancy and fresh water has killed many tanks over the years.
I didn't think the news was that big, but I will probably try one out and see how I like.
Terence Alk and CA Monitor, that would be Big news!