This document provides technical specifications for a digital projection instrument. It has a 400mm diameter projection screen that can rotate 360 degrees with an angular resolution of 1 minute. The worktable area is 450x150mm and can move in the X, Y, and Z axes with high resolution. The instrument uses imported slideways and adjustable lighting to provide clear, accurate measurements of workpieces. It has high quality optical systems and objectives that produce clear images with magnifying factors from 50x to 100x.