Cardio Calipers 3.3 is an application to be used by medical users. It lets you measure and interpret any electrocardiagram readout, whatever the format.
For this it has special measuring rulers to calculate in millimeters, seconds, and millivolts. It also has a type of compass to measure the degrees of rotation for each of the inflection points of the electrocardiagram.
It can be configured to generate statistical reports from the readings it takes.