Want to know how to accurately measure internal grooves and deep holes that standard calipers can't reach? In this video, we demonstrate the 24-150mm Digital Internal Groove Caliper with its unique cylindrical contact point. You'll see live measurements of internal groove diameters, groove widths, and deep hole dimensions in mechanical parts. We'll walk you through its operation, showcase its high-precision LCD display, and explain how it solves internal dimension measuring blind spots in machinery manufacturing and quality control applications.