Used in the chemistry, pharmacology, food and beverage, and starch industries to name a few, these dual scale, plain form hydrometers measure specific gravity / relative density g/cm of liquids lighter and heavier than water in various ranges from 0.700 to 2.00, and baume in various ranges from 10 to 70, or choose the universal model to span all ranges. lead free ballast and glass individually serialized temperature standardization: of 60°f 15°c 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.