These gages have set the standard for technology and innovation while offering excellent features at an affordable price. Their new high contrast control panel is easy to read and protected against liquid and dust penetration. All models feature automatic diameter measurements taken using TESAs patented system for determining the reversal point (Quick Center Dynamic). Features Backlit, Customizable, High Contrast Display Workshop Friendly Refined Keyboard Fine Adjustment TESA MagnauSystem Quick Center Dynamic for measuring internal or external diameters Ergonomic Design SCS calibration certificate delivered with each instrument SPC Output