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 alcoholic beverages. Commonly employed in quality control and regulatory testing to verify the performance of analytical methods and equipment. Also used in environmental testing to detect ethanol in water or air samples. Its precise concentration allows for reliable comparison and validation of test results.