Oil level sensors are mainly divided into several types, including float type, capacitance type, ultrasonic type, and resistance type. Each type has its unique working mechanism and application scenarios. Floating ball sensors use floating balls to float with changes in oil level, thereby controlling the opening and closing of switches; Resistance sensors determine the oil level by measuring the change in resistance of the liquid. These different types of sensors have their own advantages and disadvantages, and users can choose the appropriate model according to their actual needs.