The Linear BI-1E Internal Dial Caliper Gauge is a precision tool designed for measuring internal diameters with a range of .375 to 1.375 inches, with a precision of 0.001 inches. This tool, made by the trusted brand Linear, is a valuable asset for CNC machining, metalworking, and manufacturing processes, ensuring accurate measurements for quality control and inspection. The caliper gauge comes boxed and ready to be used, making it a convenient addition to any tool box for precise measurements in a variety of industrial applications.