H-B DURAC Individually Calibrated 19/31 Degree API ASTM 3H HydrometerChoose from a wide range of individually calibrated plain form models measuring the relative density (specific gravity) of oil and petroleum related products in various ranges from -1° to 91°API in accordance with the American Petr..
H-B DURAC Individually Calibrated 29/41 Degree API ASTM 4H HydrometerChoose from a wide range of individually calibrated plain form models measuring the relative density (specific gravity) of oil and petroleum related products in various ranges from -1° to 91°API in accordance with the American Petr..