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| | Name: | Bellwether | | Model: | API Scale Combined Form Hydrometers | | Description: | 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. |  |
| | Name: | Bellwether | | Model: | API Scale ASTM Plain and Combined Form Hydrometers | | Description: | Manufactured in strict accordance to specifications of ASTM (American Institute for Testing and Materials) for accuracy and design. All instruments are suitable for certification for use as a primary reference standard with NIST traceability. |  |
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