P31 Water Level Sensor Plastic Float Switch

Rather than measuring a continuous water level, this float switch gives a straightforward yes-or-no signal: a sealed magnetic float rides up and down with the water line inside its plastic housing, and once it passes the mount point it flips an internal switch open or closed. That mechanical simplicity makes it reliable for automatic sump pump activation, overflow and dry-run protection on tanks and reservoirs, and simple full/empty alerts on irrigation or livestock watering systems, without needing any analog calibration or microcontroller math the way a continuous level sensor would. Its sealed plastic housing is built to sit directly in the water being monitored, unlike a bare circuit board sensor that would corrode or short out in the same environment.