Tronic FLOAT SWITCH

A float switch is a liquid-level sensor device. It uses a hollow floating body that rises or falls with the liquid level; when the float moves to a certain point, it triggers an internal switch (often magnetic or reed-type) that opens or closes an electrical circuit. Wikipedia+1
Specifically, the Tronic branded float switch is designed to detect when a certain water or liquid level is reached and then either:

Turn a pump on or off

Trigger an alarm or alert

Prevent overflow or dry-running of equipment

✅ What it’s good for

Monitoring tank or reservoir water levels and automatically switching a pump ON or OFF when the water reaches a preset height.

Avoiding overflow in cisterns, sumps, or water storage systems.

Ensuring dry running is prevented: when the water falls too low, the float can trigger equipment shutdown.

Because of its IP68 rating, good for submerged applications (suitable for pumps/underground tanks) where the unit may be underwater.