DiaSys TruCal E is a set of four aqueous based calibrators with different levels containing biological additives from bovine origin. For veterinary or research use only. It is used for calibration of the DiaSys assays Sodium FS, Chloride 21 FS, and Potassium FS, or any other assays from other manufacturers that are used to measure Sodium, Chloride or Potassium. The unopened and opened bottles of DiaSys TruCal E must be stored at refrigerated. Once opened, DiaSys TruCal E is stable for at least 3 months.