The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Test your stress level : hold your device in your hand, press the button, and in 10 seconds you have your stress level ! ( There may be a non 0 level measured on flat surfaces : this is normal and hardware related)This app is intended for entertainment purposes only and does not provide true stress testing functionality.