IO-Link capacitive sensors in small rectangular design are advanced industrial sensors produced by leading manufacturers such as Balluff (Germany), Pepperl+Fuchs (Germany), and IFM (Germany). These sensors are widely used in automation, manufacturing, and process control industries. The compact rectangular design allows for easy integration into tight spaces, while the IO-Link communication protocol enables smart, real-time data exchange for Industry 4.0 applications. Key products include proximity sensors, level detection sensors, and object recognition sensors, which enhance efficiency and precision in industrial environments.