Used as a reference standard in analytical laboratories for the calibration of instruments such as gas chromatographs (GC) and high-performance liquid chromatographs (HPLC). Ensures accurate quantification of ethanol in various samples including pharmaceuticals, forensic specimens, and alcohol-based consumer products. Commonly employed in quality control and regulatory testing to verify the concentration of ethanol in formulations. Also used in environmental testing to assess ethanol content in water or air samples. Provides consistent and reliable results due to its precisely known concentration.