Specific gravity hydrometers are commonly used in industries such as food and beverage, chemistry, pharmacology, transportation, refrigeration, and more. This plain form hydrometer is made of lead-free ballast and glass. It is serialized and has a temperature standardization of 60°F (15°C). It is packaged with a multilanguage (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST. Note: Plain form hydrometers should be stored in a clean, dry, safe place. They should not be subjected to extreme temperatures.