what is the thing called that tells you the ph of something

what is the thing called that tells you the ph of something

Answers
Litmus Paper
javaid.aslam
13 June 2011
Litmus Paper is the wrong answer. A Litmus paper just tells whether a the substance is acidic (red litmus changes color to blue) or basic (blue litmus changes color to red)
aman
14 June 2011
The correct answer is the 'Ph paper' or 'Ph strip'. This Ph paper develops certain colors when the liquid whose Ph is to be measured comes in contact with it. Every color has a pre-defined value of Ph and the correct record of color vs Ph value is known as a Ph scale.
aman
14 June 2011
sorry, in my first post the correct relation is for acidic (blue litmus changes color to red) and for basic nature (red litmus changes color to blue).
aman
14 June 2011
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