These durable polycarbonate hydrometers wont break when dropped—perfect for industrial or laboratory use. The temperature standard for these hydrometers is 60°F (15°C). All hydrometers are individually serialized, feature metal ballast with wax epoxy and include multi-language statement of accuracy supplied by the vendor. These hydrometers are available in models measuring Baume of syrups and liquids heavier than water in various ranges from 0 to 31°. Note: Polycarbonate hydrometers are not recommended for use with petroleum-based liquids or other corrosives that would potentially affect the plastic material. They should be stored in a clean, dry, safe place and should not be subjected to extreme temperatures. 5 year warranty