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The Gould-Bass Tam 135273 Comparator features highly fluorescent markings for linear and round indications in inches with metric equivalent, ranging from 0.180" (4.6 mm) to 0.10" (0.2 mm). This Comparator is made of transparent plastic, and is used to assess linear and round defect size in the inspection booth. The Tam 135273 Comparator meets Pratt & Whitney specifications.