Ok got to experiment some at work today. Still trying to figure out software. Can save a data file of 1 screens worth of signal. Doesn't seem to matter if how long that is it only saves the current screen, but when you pull the file up you can zoom in completely.
I saved a 9 second frame of secondary ignition on a 1995 Mercury mystique. This is a waste spark type system only 1 plug wire being watched. The screen shots are at full resolution then zoomed in. Can just pinch to horizontally.
If you touch the screen where the voltages are listed, can move the data up or down and zoom vertically. Did not get a shot of that.
https://dl.dropboxusercontent.com/u/13394677/Screenshot_2015-03-07-17-51-56.png
https://dl.dropboxusercontent.com/u/13394677/Screenshot_2015-03-07-17-52-25.png
https://dl.dropboxusercontent.com/u/13394677/Screenshot_2015-03-07-17-52-42.png
https://dl.dropboxusercontent.com/u/13394677/Screenshot_2015-03-07-17-53-07.png