The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Michal Pietras:
SPECIAL INTRODUCTORY PRICE FOR A LIMITED TIMEHeart Counter is the ultimate app for heart rate measurement. It is a great alternative to using a stopwatch and counting heartbeats it is quicker and provides more accurate results. Just press the big red button every time you detect a pulse it's that simple! Heart Counter registers the number of beats and the intervals between them, and automatically calculates your heart rate. With precise measurement you can obtain an accurate result after just a few seconds, but to increase accuracy you can continue measuring for up to one minute.