Thread Check Inc is proud to be an authorized distributor for S-T Industries. SCHERR-TUMICO – S-T INDUSTRIES has been manufacturing measuring instruments in the United States for over 60 year. S-T Industries introduced the tubular frame micrometer in the early 1940's. They premiered the Model 1500 vertical beam optical comparator in the 1950's and the Model 2500 30" optical comparator in the 1960's. Since 1983, S-T Industries - SCHERR-TUMICO – S-T INDUSTRIES has expanded the product lines to include a full range of precision hand measuring tools, optical comparators and video inspection systems.