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About product and suppliers:
        Alibaba.com offers 243 optical association products. About 2% of these are testing equipment. 

A wide variety of optical association options are available to you, such as free samples. 

There are 229 optical association suppliers, mainly located in Asia. The top supplying countries are Taiwan, United States, and China (Mainland), which supply 87%, 5%, and 3% of optical association respectively. 

Optical association products are most popular in Northern Europe, South Asia, and Southern Europe. 

You can ensure product safety by selecting from certified suppliers, including 9 with Other, 2 with ISO9001, and 1 with ISO14001 certification.