Used extensively by the beverage industry, these control drink flasks are designed to equate, in terms of capacity, an empty, dry container. The flasks, when properly filled, will hold the exact same content as a bottle and can be used to check proportioning accuracy. All flasks are Pyrex and are individually calibrated with water "To Contain", using standards certified by the NIST to assure maximum accuracy and maintain tolerances. Includes certificate of traceability.