H-B DURAC Safety 0.600/0.710 Specific Gravity Combined Form Thermo-Hydrometer (B61821-0000) Conforms to the accuracy requirements for ASTM thermo-hydrometers Combined form; measures specific gravity/relative density (g/cubic cm) of a variety of liquids; Range: 0.600/0.710 Built-in thermometer contains mercury-free blue spirit organic liquid fill; temperature scale 0/150 degrees F Individually serialized; features lead free ballast and glass Packaged with a multi-language (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST; Former HB Instrument # 50910