The Mitutoyo 209-732 Internal Groove Caliper is a high-quality precision tool designed for measuring internal grooves with a diameter ranging from 2-6 inches. Made by the reputable brand Mitutoyo, known for producing reliable and accurate measurement tools in the CNC, metalworking, and manufacturing industries. With a resolution of .0005 inches, this caliper is ideal for detailed and precise inspections, ensuring quality control in various industrial settings. This caliper is a valuable asset for professionals seeking accurate and dependable measurements in their work.