Hydrometers - Combined Form ThermohydrometerL K Industries API hydrometers have multiple ranges that are precision grade for measuring API gravity of crude oil and other petroleum products. We offer all ranges that comply with API (American Petroleum Institute and The American Society of Testing Materials (ASTM) E100 standards, from 1 degrees to 96 degrees. Made in the USA out of precision grade glass and ballast to ensure accuracy. Each is serialized, traceable to NIST, and inspected in our
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