Every substance around you, from the orange juice you drink and the water you use to bathe to the saliva in your mouth, has a pH level. Testing the pH of liquid, which can be done in different ways, tells you whether it is acid, alkaline or neutral. On the pH scale, which runs from 0 to 14, 7 is neutral, anything below 7 is acidic, and anything above 7 is alkaline. Before using a pH probe and meter to test pH, test the meter in a substance with a known pH rating to calibrate it. For example, pure or distilled water has a pH level of 7. If necessary, adjust the meter accordingly.
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LITMUS TEST | definition in the Cambridge English Dictionary
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Easy Litmus Strips
You can make paper test strips to determine the pH of an aqueous solution by treating filter paper with any of the common pH indicators. One of the first indicators used for this purpose was litmus. Litmus paper is paper that has been treated with a specific indicator—a mixture of 10 to 15 natural dyes obtained from lichens mainly Roccella tinctoria that turns red in response to acidic conditions pH 7.
A urine test strip or dipstick is a basic diagnostic tool used to determine pathological changes in a patient's urine in standard urinalysis. A standard urine test strip may comprise up to 10 different chemical pads or reagents which react change color when immersed in, and then removed from, a urine sample. The test can often be read in as little as 60 to seconds after dipping, although certain tests require longer.