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About product and suppliers:
        Alibaba.com offers 248 pd ruler products. About 67% of these are other optics instruments, 17% are medical optical instruments, and 14% are rulers. 

A wide variety of pd ruler options are available to you, such as yes, no. You can also choose from paid samples. 

There are 255 pd ruler suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Pakistan, which supply 97%, 1%, and 1% of pd ruler respectively. 

Pd ruler products are most popular in Western Europe, Mid East, and North America. 

You can ensure product safety by selecting from certified suppliers, including 53 with ISO13485, 50 with Other, and 25 with ISO9001 certification.