Premium Material: This liquid float switch is mainly made of 307 stainless steel, which is durable, corrosion-resistant, and heat-resistant. It is a food-grade material that does not release harmful substances. Simple and Practical: The liquid level sensor is a filling level control device with a simple structure and easy handling. It does not require a power supply or complex circuits. Compared with traditional mechanical switches, it is smaller and has a longer service life. The floating ball in this level switch can be changed to allow both filling and deflation. Working Principle: Our liquid float switch is composed of a magnetic spring switch and a float ball with magnetic material inside. When the liquid level rises or falls, the magnetic material of the float ball interacts with the spring magnetic contact switch to control and display the level. Instructions: There is a small mark on one end of the float ball. If the end with this mark points upwards, it is the filling