pH indicator rolls are recommended for laboratory uses where higher quality indicators are expected. The clear plastic dispenser protects the indicator paper from environmental fumes that may change the color of paper. The color chart is inside the dispenser. Each roll contains 500cms of 7mm wide pH paper.

They are highly recommended for measurement of the pH of weakly alkaline or strongly acidic solutions. You can dip a piece of indicator in the test solution or you can transfer a drop of test sample to a piece of indicator paper.
Keywords: pH indicator paper, pH paper.

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