Using Pulse Phone you can measure your Heart Rate simply by using your iPhone (4) and it’s camera and flash.
By placing your finger over the iPhone (away facing) camera 
and it’s lit up flash the application uses the color variances in what the camera sees to measure you’re your Beats Per Minute.
The Pulse Phone app costs only $1.99 and for those who need it, I’d say it’s worth it.
There’s an adjustable sensitivity level and a comprehensive history file from which you can email one or more of your results.
*yes, the results in the image here are mine*
Pulse Phone is one of those nice little apps that might be useful some day. I think I’ll keep it on my phone 
