Hydrometers
| 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 | 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 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 | 
| Choose from a wide range of individually calibrated plain form models measuring the relative density...H-B DURAC API ASTM Hydrometers with Individual Calibration Report; Traceable to NIST 9 results | 

 
                     
                     
                     
                    