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The American Society for Testing and Materials (ASTM) Specification E 100 describes hydrometers using the API (American Petroleum Institute) scale and others in degrees Specific Gravity.
330mm Long Plain Hydrometers – American Petroleum Institute API Scale
adjusted at 60°F for Petroleum Products and other liquids of low surface tension.
330mm Long Plain Hydrometers – Specific Gravity Scale
adjusted at 60°F for Petroleum Products and other liquids of low surface tension.
330mm Long Hydrometers
adjusted at 60°F for heavier liquids of medium surface tension.