ASTM Specific Gravity Hydrometers
VEE GEE Scientific ASTM Specific Gravity Hydrometers are calibrated at 60°F and manufactured to the specifications of the American Society for Testing and Materials (ASTM). Select the hydrometer that you need by matching the ASTM number shown. Specific Gravity, also known as relative density, is the ratio of the mass of a liquid to the mass of an equal volume of distilled water.
For hydrometers with ASTM numbers from 82H through 90H and 111H through 120H have an approximate length of 330 mm.
For hydrometers with ASTM numbers from 125H through 141H have an approximate length of 260 mm.