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About product and suppliers:
        Alibaba.com offers 148 gem detector machine products. About 79% of these are industrial metal detectors. 

A wide variety of gem detector machine options are available to you, 

There are 148 gem detector machine suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of gem detector machine respectively. 

Gem detector machine products are most popular in Africa, Domestic Market, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 26 with ISO9001, 25 with Other, and 9 with OHSAS18001 certification.