It is used as a certified reference material to verify the accuracy and performance of Karl Fischer moisture determination systems.

It is used as a quality control standard to validate the accuracy precision and calibration of both volumetric and coulometric Karl Fischer titration methods by confirming correct measurement of a known water content.

HydraTrace Test Substance di-Sodium Tartrate Dihydrate (15.66% water content) is a certified secondary reference standard with a well-defined water content used to verify the performance and accuracy of Karl Fischer moisture determination systems.