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About product and suppliers:
        Alibaba.com offers 7,461 30mm test tube products. About 1% of these are test tube, 1% are packaging tubes, and 1% are beaker. A wide variety of 30mm test tube options are available to you, such as free samples, paid samples. There are 7,465 30mm test tube suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Singapore, which supply 99%, 1%, and 1% of 30mm test tube respectively. 0mm test tube products are most popular in Mid East, Southeast Asia, and South America. You can ensure product safety by selecting from certified suppliers, including 1,932 with ISO9001, 231 with ISO/TS16949, and 162 with ISO14001 certification.
        
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