- The digital depth gauge is a precise tool for hole depth measurement in woodworking, metalworking and other applications, helping you achieve accurate, repeatable results and reduce guesswork. - It measures in metric (mm) and imperial (inches) units and is easy to read through the LCD display. - Measuring range is 80 mm (3.125 inches) with high accuracy of ± 0.05 mm (± 0.002 inches) and a resolution of 0.1 mm (0.004 inches). - The zero reference point can be set at any point on the ruler to perform relative measurement procedures. - This design uses the hard base function, which is mainly used to set the tool depth on the router and adjust the backstop. It is easier to make horizontal and vertical measurements on metal floors. - Use scenario: set the router depth before milling or dado cuts to ensure consistent results. - Use scenario: measure hole depths in wooden or metal workpieces to verify tolerance. - Use scenario: perform relative depth measurements by zeroing at a chosen reference point for features with stepped depths.