This 0-12" (0-305mm) NIST Traceable digital caliper has 3.5" long jaw blades for use in measuring cylinders. It features a large, easy-to-read digital display, ergonomic thumb rest; rolling thumb wheel; hold feature, Inch/metric conversion, preset mode now includes offset for inside jaws. It provides digital readout to .0005"/0.01mm for error-free reading and accuracy. • Hold feature • Preset mode now includes offset for inside jaws. • Ergonomic thumb rest for easy adjustment • Full size .0005" digital display • For larger workpieces. The long jaws permit greater accessibility and easier measurements • All sizes feature fine adjustment screw • Inch/metric conversion