Physician mode (requires verification) is very interesting. Does give you a one lead tracing. Sensor only fits a iPhone 4, but because it uses Bluetooth will work with an iPhone 5. Software a bit buggy. Typically after taking a tracing of about 10 seconds I have to force quit the application. But when I reopen, the tracing is there and can be viewed! So it works to show basic rhythms...sort of.
HerrTed about ECG Check