H-B Instrument B61823-0500 Instrument Hydrometer, -49 to 61&deg; API, Plain form Conforms to the accuracy requirements for ASTM thermo-hydrometers Combined-form; measures the relative density (specific gravity) of oil and petroleum related products in accordance with American Petroleum Institute (API) standards; Range: 49/61 degrees Built-in thermometer contains mercury-free blue spirit organic liquid fill; Range: 0/150 degrees F Individually serialized; 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 # 4855