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About product and suppliers:
        Alibaba.com offers 11,003 tester pen products. About 33% of these are ph meters, 25% are testing equipment, and 5% are fiber optic equipment. A wide variety of tester pen options are available to you, such as free samples, paid samples. There are 10,992 tester pen suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Taiwan, which supply 99%, 1%, and 1% of tester pen respectively. Tester pen products are most popular in North America, Mid East, and South America. You can ensure product safety by selecting from certified suppliers, including 1,454 with ISO9001, 614 with Other, and 80 with ISO14001 certification.
        
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