These types of sensors are going to be able to measure and determine the level of a liquid, powder, grains, and other similar materials inside of a container. You will find different types of level sensors out there that make use of different types of technologies in order to provide accurate measurements. Some examples include hydrostatic pressure sensors, air bubblers, and resistive chain level sensors. A fuel level sensor, which is what you have in your vehicle or a generator, is a good example of a level sensor. A water level sensor is another good example.