Available in a variety of models measuring specific gravity of heavy and light liquids in various ranges from 0.650 to 2.000 in accordance with the american society of testing materials astm e100 standards. conform to the accuracy requirements of astm hydrometers commonly used in industries such as food and beverage, chemical, pharmacology, transportation, refrigeration and more lead free ballast and glass individually serialized temperature standardization: 60°f/60°f hand inspected by our u.s. Quality team packaged with a multi-language english, french, german, italian, portuguese, and spanish statement of accuracy indicating accuracy traceable to nist note : hydrometers should be stored in a clean, dry, safe place, and should not be subjected to extreme temperatures.