The upgraded Neptune MOS replaces the old OS-1-M and features an improved design that can fit into tighter areas and help protect the sensor from water damage. It plugs into an Apex FMM port and uses reflected infrared light to signal your Apex when the wet/dry state changes. This allows it to be used in multiple applications like ATO, high-level warning sensor, water storage level sensor, etc. The MOS is compact and waterproof, plus the strong magnetic mount can be used to attach it to glass or acrylic up to 1/2" thick.
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