EP Calipers 3 is a complete rewrite of the original EP Calipers app for modern versions of Windows (10 and 11). The app uses electronic calipers to make accurate measurements of intervals from electrocardiographic recordings. Images can be loaded into the app for measurements, or the app window can be made transparent to float over other windows on your desktop. Easily make heart rate, mean interval, and QTc interval calculations using the app. All features are easily customizable using an easy to use settings screen. Supports light and dark system modes, and all image types including multipage PDF files.