An ECG measurement approach for any multi-touch screens comprises the following steps: 1) display ECG on the screen 2) use two fingers to touch the screen and the two touch points have two vertically projected points on the actual ECG waves 3) draw the horizontal and vertical baselines to show the x interval in milliseconds and y interval in microvolt 4) move any one or both of the two fingers touch points on the screen, the projected points and the horizontal/vertical baselines updated synchronously, as well as the measurements 5) measure the different part of the ECG waves using this approach, including the wave top points, wave beginning and ending points. This approach can be used as a measurement tool to any graphs of functions over time displayed on the multi-touch screen, like EEG.
