pH Meter is a scientific instrument that measures hydrogen ions activity in water based solutions indicating its acidity of alkalinity expressed as pH. So, pH is a unit of measure which describes the degree of acidity or alkalinity of solution. Therefore, the scale of pH Meter range from (0 – 14): 1- If the pH less than 7 the solution will be acid, 2- If the pH greater than 7 the solution will be basic, 3- If the pH equal 7 the solution will be Neutral #geneticteacher

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