These plain form hydrometers are available in a variety of models measuring the relative densities (...
H-B DURAC API ASTM Hydrometers; Traceable to NIST 29 results
These plain form hydrometers measure the relative density (specific gravity) of oil and petroleum re...
H-B DURAC API Plain Form Hydrometers; Traceable to NIST 11 results
These combined-form hydrometers, with a convenient, built-in thermometer, come in a wide range of mo...
H-B DURAC Safety API Combined Form Thermo-Hydrometers; Traceable to NIST 10 results

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