Modern and compact magnetic water level monitoring.

• Enhanced appearance, feel, and design.
• Accurate control of water level.
• Integrated magnetic base.
• External magnet with silicone casing.
• Completely waterproof.
• The compact shape fits in tight spaces.
• Strong magnetic base suitable for glass or acrylic thickness up to 1/2".

The Neptune MOS replaces the previous OS-1-M and features an updated design that fits in narrower spaces and helps prevent water intrusion into the sensor. The MOS connects to an Apex FMM port and uses reflected infrared light to signal your Apex when changing state from wet to dry or dry to wet. This sensor can be used to build your own ATO (auto-top-off), as a high-level warning sensor in your sump, water storage level sensor, and much more. Sensors can be placed on any type of tank with wall thicknesses of up to 1/4".