The A3 Jr will be a new, "monitoring-only," system that offers the same monitoring the A3 Apex offers without the control of the EB832. The A3 Apex Jr. is the first monitoring only solution that monitors exactly what you need; and, when ready, opens the door to control for all aquarist.
The most successful aquariums are those where the owner has the most understanding of what is going in their little world-in-a-glass-box. However, the real key to enjoying this hobby is to do that without making it a full time job!
Owning the Apex is the best way to get you back to focusing on the things you love like your fish and coral, and less about temperature issues, pH levels, light timers, dosing tanks, vacation plans, etc.
The most important aspect of having an Apex though is the disaster prevention it provides. The Apex will notify you when things go bad, giving you time to take action and prevent an aquarium catastrophe.
Of course you also unlock the door to more advanced things such as LED dimming, variable pump control, auto top-off, calcium reactor control, ozone control, auto dosing of elements, auto-feeding your fish, and much more!
Neptune Systems A3 Apex Jr System -- Get the essential monitoring you need now, expand into control later
*ORP probe sold separately
In addition to all the incredibly cool things an Apex does, first and foremost it protects your tank from all sorts of very common catastrophes like overheating due to faulty tank heaters or HVAC issues, leakages and overflows, out of range parameters, etc. And, once issues are detected, the Apex can take corrective action to reduce the likelihood of serious damage and then notifies you so you can take it from there.
Apex systems have already saved many aquarium owners thousands of dollars in livestock, equipment, flooring, etc. Leaving home for 2 hours or 2 weeks will no longer involve the anxiety of wondering what you will come home to. This reason alone is enough to justify purchasing an Apex.