Editing Hydrometer (section)

==Scales==
[[File:Brine concentration measurement.jpg|thumb|upright|A [[NASA]] worker using a hydrometer to  measure the [[brine]] density of a salt evaporation pond]]
Modern hydrometers usually measure [[specific gravity]] but different scales were (and sometimes still are) used in certain industries.  Examples include:

* [[API gravity]], universally used worldwide by the petroleum industry.
* [[Baumé scale]], formerly used in industrial chemistry and [[pharmacology]]
* [[Brix]] scale, primarily used in fruit juice, wine making and the sugar industry
* [[Oechsle scale]], used for measuring the density of [[grape must]]
* [[Plato scale]], primarily used in [[brewing]]
* [[Twaddell scale]], formerly used in the bleaching and dyeing industries<ref>{{Cite book |last=Dick |first=William Brisbane |url= |title=Dick's Encyclopedia of Practical Receipts and Processes |date=1975 |publisher=Dick and Fitzgerald, Publishers |isbn=9780308101579 |location=New York |language=en |chapter=Degrees of Baum'e |chapter-url=https://chestofbooks.com/reference/Encyclopedia-Of-Practical-Receipts-And-Processes/Degrees-of-Baum-e.html}}</ref>