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API Scale Hydrometer measures the scale which was selected in 1921 by the American Petroleum Institute (API), the U.S. Bureau of Mines, and the National Institute of Standards and Technology (NIST) as the standard hydrometer scale for petroleum products. The API Scale is based on the following formula:°API 60°F = 141.5/(Specific Gravity 60°F) - 131.5
The Thermometer Scale (where applicable) for VEE GEE Hydrometers with Thermometer is located in the body. Suitable for certification for use as a primary reference with NIST traceability.
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What is a Hydrometer? How Does it Work and Where is it Used?
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