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Thomas Specific Gravity And Baume Non-Mercury Thermo-Hydrometer, Made from heavy-walled anneealed tubing for maximum strength, Built in non mercury thermometer, Lead free ballast, Conforms to ASTM accuracy requirements. Each thermo-hydrometer comes with a Certificate of Conformance traceable to NIST. Bio-degradable, non-mercury performance liquid provides safe and easy cleanup in case of breakage. Scales are bold and easy to read. All instruments measure 15" in length and come with a built-in thermometer. Baume Range is 0/26, Thermometer Range is 20 to 150.