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Ensuring the quality of milk products, particularly the fat content, is of paramount importance in the food industry. This research introduces a compact non-invasive microwave sensor designed for assessing the fat content in milk samples. The sensor operates at 2.4 GHz within the ISM band and incorporates a single Complementary Split Ring Resonator (CSRR) metamaterial. Its compact size measures 20mm x 20mm and is simulated on an FR4 substrate, the sensor aims to differentiate fat content in milk ranging from 0.94% to 3.17% in 5ml sample liquids. Employing the dielectric properties of milk, changes in the S21 parameter are monitored through ANSYS HFSS Simulation. The compact design of the CSRR metamaterial enhances sensitivity to fat content variations, providing a cost-effective and minimally invasive solution for real-time monitoring of milk quality. This study contributes to the ongoing exploration of non-invasive sensing technologies, presenting a practical method for assessing milk fat content without the drawbacks of traditional invasive methods. The proposed RF-based sensor's ability to differentiate between fat content levels based on dielectric properties showcases its potential applicability in the food industry. This innovation offers a valuable tool for quality control in milk processing, ensuring product consistency and meeting regulatory standards. [ABSTRACT FROM AUTHOR]