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Calibrated at 68°F General Specifications for VEE GEE® ASTM Hydrometers: Manufactured in strict accordance to specifications of ASTM (American Society for Testing and Materials) for accuracy and design. All instruments are suitable for certification for use as a primary reference standard with NIST traceability. Specific Gravity, also known as relative density, is the ratio of the mass of a solid or liquid to the mass of an equal volume of distilled water. The standard temperature of calibration in the U.S. is 60°F/ 60°F. 0.995 to 1.038 Specific Gravity Range. 0.001 Subdivision. ASTM Number 151H