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About product and suppliers:
        Alibaba.com offers 3,910 ph meter pen products. About 86% of these are ph meters, 1% are ballpoint pens. A wide variety of ph meter pen options are available to you, such as free samples, paid samples. There are 3,905 ph meter pen suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and India, which supply 98%, 1%, and 1% of ph meter pen respectively. Ph meter pen products are most popular in North America, Southern Europe, and Western Europe. You can ensure product safety by selecting from certified suppliers, including 477 with ISO9001, 330 with Other, and 152 with ISO14001 certification.
        
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