The capacitive level meter is designed based on the principle of capacitance. It can measure the liquid level with high precision (accuracy up to millimeter level) and has temperature monitoring function. It is specially optimized for complex environments such as rice fields, with strong anti-interference ability. Compared with ultrasonic level meters, it is not affected by the occlusion of rice field leaves, and the data is more reliable; compared with hydraulic level meters, there is no risk of probe clogging, and it is suitable for silt and impurity environments.