Potassium biphthalate buffer tablets pH 4.0 are widely used in laboratories for calibrating pH meters and ensuring accurate pH measurements. They provide a stable and precise reference point, which is essential for experiments requiring consistent pH conditions. These tablets are particularly useful in analytical chemistry, environmental testing, and quality control processes where maintaining a specific pH is critical. They are also employed in educational settings to teach students about pH measurement and buffer solutions. The convenience of pre-measured tablets simplifies preparation, ensuring reproducibility and reliability in various scientific applications.