Description
Description
H-B DURAC 29/41 Degree API ASTM 4H Hydrometer. These plain form hydrometers are available in a variety of models measuring the relative densities (specific gravity) of oil and petroleum products in various ranges from 1° to 96°API in accordance with the American Petroleum Institute (API) and the American Society of Testing Materials (ASTM) E100 standards.
Note: Hydrometers should be stored in a clean, dry, safe place, and should not be subjected to extreme temperatures.






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