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VEE GEE Scientific Hydrometer Specific Gravity 6602$27.40
The scientific ultra precision specific gravity hydrometer measures the ratio of the mass of a solid or liquid to the mass of an equal volume of distilled water. It is calibrated as the standard temperature calibration in the U.S. at 60°F/60°F.
It has 1.54 to 1.61 range and is under specifications for ASTM (American Society for Testing and Materials) for accuracy and design.