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A modern digital pH meter next to a box of paper pH strips. pH measuring. Translation right box: "100 test strips. pH-indicatorstrips, not bleeding Stock Photo - Alamy
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TASU pH 1-14 Test Indicator Litmus pH Paper, ph Meter, Litmus Paper for Water Testing, Water and Soil testing with 80 Strips, 1-14 Test Indicators with pH Strip(80 Strips) : Amazon.in: Industrial & Scientific
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