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Many, but one example is the Kelvin Temperature Scale whose 0º is Absolute Zero.
the scale used to measure acid and bases is called a pH scale. the numbers range from 1-14 and go as following- to show an acid= 1-6 nuetral= 7 to show a base= 8-14
Many scales such as sound and PH are log scales. The scale used to measure earthquakes is also a log scale. Whenever the data has a very wide range, a log scale might help.
A digital scale is a scale that measures mass but the numbers pop up digitally.
u can chek the hardness by pH scale...lolz