IMPA 651390
单位: PA
PH TEST PAPER 0-14
For measuring acidity and alkalinity (hydrogen ion concentration) based on a scale of 0 to 14 where 7 represents the value for pure water at 25oC or neutrality. Values less than 7 represent increasing hydrogen-ion concentration or increasing acidity, and a value greater than 7 represents decreasing hydrogen-ion concentration or increasing alkalinity.
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