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Postato il 04/07/2021 : 04:21:12 pH indicator papers have been on the market for decades and are the appreciated standard for many applications. NEWSTAR pH indicator papers make it easy to measure pH value without the use of any instruments. For each pH value , NEWSTAR pH indicator papers show a single color which can be matched with the color scale at intervals of 0.2–1 pH unit.https://www.newstarsciences.com/ph-indicator-paper/0-14-universal-indicator-paper.html