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Q-Mark Manufacturing Inc. is rooted in Southern California's proud manufacturing tradition history. Q-Mark’s president and founder, Mark Osterstock, apprenticed in precision metalworking as a teenager in his father's twelve-man tool and die shop in Inglewood, California. Today, Q-Mark Manufacturing proudly manufactures probe styli in its world-class Southern California facility and serves manufacturers around the globe. Q-Mark products are proudly made right the first time in the USA.