The API Scale 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 formula below.
General Specifications for Bellwether 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.
The API Scale 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 formula below.
The thermometer scale for Bellwether Hydrometers (w/ Thermometers) is located in the
body. A correction scale for conversion of readings to 60°F is printed opposite the
temperature scale.