H-B DURAC 0.990/1.040kg/L Draft Survey Hydrometer (B61809-0500) DURAC draft survey hydrometer is used for determining the Apparent Density of sea/fresh water; used for bulk carrying cargo vessels; helps determine the amount of cargo that can be loaded Range: 0.990 to 1.040kg.L; divisions: 0.0005; length: 330mm (13in) Temperature of Standardization 15C/15C Individually serialized and features a metal ballast Tested and calibrated in our exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DKD/PTB