Methyl red is widely used as a pH indicator in various laboratory settings. It is particularly useful in microbiology for the methyl red test, which helps identify bacteria that produce stable acids through glucose fermentation, such as those in the Enterobacteriaceae group. In analytical chemistry, it serves as a visual indicator in titrations, changing color from red to yellow over the pH transition interval of 4.2-6.2. Additionally, it is employed in environmental studies to monitor pH levels in water bodies and soil samples. Its distinct color change makes it a reliable tool for detecting pH variations in scientific research and industrial processes.