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A ph meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as ph.the ph meter measures the difference in electrical potential between a ph electrode and a reference electrode, and so the ph meter is sometimes referred to as a "potentiometric ph meter". The difference in electrical potential relates to the acidity or ph of the solution. The ph meter is used in many applications ranging from laboratory experimentation to quality control.if it turns pink, it's acid I think—you probably learned that useful phrase once upon a time, along with the second half of the same rhyme: "and if it turns blue, it's an alkali true." measuring acids and alkalis (bases) with litmus paper is something pretty much everyone learns how to do in school. It's relatively easy to compare your little strip of wet paper with the colors on a chart and figure out how acidic or alkaline something is on what's called the ph scale

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