Tom Groff

Tom Groff is North American sales manager for Optical Gaging Products Inc. (OGP, Rochester, NY). For more information, call (585) 544-0400, e-mail or visit


Contour Projectors-Keeping Up with the Times

By Tom Groff
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The contour projector, also known as an optical comparator or shadowgraph, has been used for quality control inspection for more than 70 years. Despite its maturity, the projector is still around and going strong.
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