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About product and suppliers:
        Alibaba.com offers 22,480 rtk products. About 27% of these are other measuring & analysing instruments, 2% are navigation & gps, and 1% are radio control toys. 

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

There are 23,589 rtk suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Spain, which supply 95%, 4%, and 1% of rtk respectively. 

Rtk products are most popular in South America, South Asia, and North America. 

You can ensure product safety by selecting from certified suppliers, including 1,184 with ISO9001, 900 with Other, and 11 with ISO/TS16949 certification.