Tall Form High Precision Specific gravity Hydrometer

· A serial number is printed on the scale and a certificate of traceability is included · The hydrometer meets or exceeds the requirements in ASTM specification E100, and it is calibrated to ASTM specification E126 to ensure accuracy · The certificate of traceability indicates that the hydrometers are manufactured using devices calibrated using NIST traceable standards · The ballast is made from steel pellets and a binder, and it is free of heavier metals