A digital depth caliper is a precision measuring instrument used to accurately measure the depth of holes, slots, or recesses. Its design typically includes a main scale, a sliding depth probe, and a digital display for precise readings. Users insert the probe into the recess to measure its depth, and the digital display provides instant measurements with high accuracy and resolution. This tool finds applications in various industries such as manufacturing, woodworking, and metalworking for quality control and precise machining. Its strength lies in its ease of use, quick and accurate measurements, and versatility for measuring depths in a wide range of workpieces and materials.