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About product and suppliers:
        Alibaba.com offers 775 optical ruler products. About 18% of these are other optics instruments, 6% are rulers. 

A wide variety of optical ruler options are available to you, such as plastic, metal, and wood. You can also choose from yes, no. As well as from straight ruler, triangular ruler. And whether optical ruler is free samples, or paid samples. 

There are 775 optical ruler suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of optical ruler respectively. 

Optical ruler products are most popular in North America, Western Europe, and Eastern Asia. 

You can ensure product safety by selecting from certified suppliers, including 547 with Other, 220 with ISO9001, and 37 with ISO13485 certification.