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Grotek pH Test Strips/Litmus Paper nude wire core ducting For best resultspH Paper (Litmus Paper) Simple and Reliable pH Testing Without a Meter pH paper, commonly referred to as litmus paper, provides a quick and convenient way to determine the pH level of a solution without using a pH pen or electronic meter. It is an ideal solution for growers, educators, and technicians who require fast, visual pH indication. What Is pH Paper? pH paper is a chemically treated test strip that changes color when exposed to a liquid. By