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About product and suppliers:
        Alibaba.com offers 215 pd ruler products. About 65% of these are other optics instruments, 14% are rulers, and 3% are other measuring & gauging tools. 

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

There are 222 pd ruler suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Pakistan, which supply 96%, 2%, and 1% of pd ruler respectively. 

Pd ruler products are most popular in Western Europe, Mid East, and Eastern Asia. 

You can ensure product safety by selecting from certified suppliers, including 47 with Other, 45 with ISO13485, and 23 with ISO9001 certification.