Neptune Optical Level Sensor w/Magnetic Mount
OPTICAL WATER-LEVEL SENSORS
There are many useful purposes for water-level sensors on an aquarium. They can help you build an auto-top-off, monitor the levels in your supplement containers, even help automate saltwater mixing containers. Traditionally float switches have been the most commonly used types of these devices, however they are prone to all kinds of failure. On the other hand, the solid-state, optically-controlled sensors used with the FMM are much more reliable and dependable.
These optical sensors work by using an LED emitters and receptor in clear enclosure such that when it becomes wet, the light bends and no longer completes the circuit.
Easy to use
Of course you could always add water-level sensors to your Apex – but it was more complicated than most users could handle. Now, with the FMM and these optical water-level sensors, you just plug them in! No wire-stripping, no breakout box necessary!