Source: L.S. Starrett Co. The L.S. Starrett Co. showcases quality control inspection technology including its HDV 250 Digital Comparator system, electronic height gages, a thread gaging line and the Digital Readout series for advanced gaging applications. Starrett is also featuring its full line of precision solutions from vision metrology systems and measuring tools to granite surface plate, laser, force measurement and custom gaging. The Starrett HDV 250 Digital Comparator