The ReefATO+ is an exceptionally reliable auto top-off system that includes a highly accurate temperature monitor plus an external leak detector and is supplied with a smart controller and useful ReefBeat features. It has a unique solid-state level sensor, with five titanium probes that can pinpoint if you are above, below, or at the desired water level, along with backup OFF sensors, a fail-safe mechanism that stops the pump if it is operating for too long, and of course ReefBeat notifications if anything is out of the ordinary.