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About product and suppliers:
        Alibaba.com offers 1,027,483 ph products. About 1% of these are ph meters, 1% are water filters. 

A wide variety of ph options are available to you, such as free samples, paid samples. 

There are 1,016,142 ph suppliers, mainly located in Asia. The top supplying countries or regions are China, Hong Kong S.A.R., and Philippines, which supply 85%, 9%, and 2% of ph respectively. 

Ph products are most popular in Eastern Europe, Western Europe, and North America. 

You can ensure product safety by selecting from certified suppliers, including 200,649 with ISO9001, 25,201 with Other, and 5,887 with ISO14001 certification.