Level gauges are one of the important tools in various industries that are used to measure the level of liquids and solids in tanks. These devices work with the help of various technologies such as radar, ultrasonic, capacitive and mechanical. In the oil and gas industries, level gauges are used to control the amount of materials in refinery tanks and transmission lines. Also, in the chemical and petrochemical industries, these devices play a role in the precise management of the amount of raw materials and finished products. In the water and wastewater industries, level gauges help regulate the water level in treatment tanks and dams. In the food and pharmaceutical industries, high accuracy in measuring the level of liquids and solids is of great importance. These tools reduce material waste and optimize the production process. With the advancement of technology, digital level gauges have enabled remote monitoring and transmission of accurate data to central control systems. Choosing the right type of level gauge depends on the environmental conditions, the type of material being examined and operational needs.