Specific gravity hydrometers are the most widely used hydrometers, common in industries such as food and beverage, chemistry, pharmacology, transportation, refrigeration, and more. Made of lead-free ballast and glass, this plain form hydrometer measures the specific gravity of heavy liquids in accordance with the American Society of Testing Materials (ASTM) E100 standards. It conforms to the accuracy requirements of ASTM hydrometers as listed. It is serialized and has a temperature standardization of 60°F/60°F. It is packaged with a multilanguage (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST. Note: ASTM hydrometers should be stored in a clean, dry, safe place. They should not be subjected to extreme temperatures.