Sell pH paper or litmus paper at pH meter.
Indicator paper is used as a tool to determine whether a solution is acidic and alkaline. Where, if the PH paper is red when immersed in a solution, then the solution is acidic. Meanwhile, if the PH is immersed in a solution and is blue, then the solution is alkaline.
PH paper specifications:
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Ph range between 0 - 14
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Accuracy Ph 0.5
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Perbuah consists of 100 papers