Butyrometer is used to measure the fat content in milk and dairy products accurately. The butyrometer works on the principle of acid digestion and centrifugation. A known volume of milk is mixed with sulfuric acid, which dissolves the non-fat solids, and then centrifuged to separate the fat. The volume of the separated fat is then read from a graduated scale on the butyrometer tube, providing a direct measure of the fat percentage in the sample. This method is crucial for quality control in dairy processing, ensuring that products meet specific fat content standards.