Neptune Systems Optical Level Sensor with Magnetic Mount V2 itemID-12496 Use of a filter bag

Use of a filter bag is recommended

Suitable for use by aquarium hobbyists of all skill and experience levels

Precise water level control

Removable Carbon Filter Cup

Low heat exchange

Neptune Systems Optical Level Sensor with Magnetic Mount V2 itemID-12496 Use of a filter bagModern & compact magnetic water level monitoring Improved look, feel, and design Precise water level control Built in magnetic mount Silicone encased external magnet Completely waterproof Compact form factor fits into tight spaces Strong magnetic mount suitable for glass or acrylic up to 1 2" thick The Neptune MOS replaces the previous OS 1 Optical Sensor and features an updated design that fits into tighter spaces and helps to prevent water incursion