Durac hydrometers have convenient built-in thermometers to measure the relative density i.e. the specific gravity of petroleum and oil-related products in temperatures up to 158 degrees F. They feature lead-free ballast having glass construction for visualising accurate measurements and are ideal for chemical, food & beverage, transportation, pharmacology & refrigeration applications. These individually serialised hydrometers have waterproof temperature probes and contain mercury-free, organic liquid fill for indicating temperatures. Choose from a wide range of these hydrometers, available in API ASTM, liter, salt brine, Baume, Brix, humidity and NaCl scales for various types of measurements.