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 Timothy Morgan:
SwitchTanks helps you track your fuel usage on low-wing aircraft that feed from only one wing tank at a time. After takeoff, simply select the fuel tank you are currently feeding from. As you switch tanks, mark the new tank on the app. Before landing, you will be able to easily see which tank likely has more fuel.Also included is a configurable alarm that sounds when it's time to switch tanks.This app is intended to be straightforward and simple to use. There's no setup or learning curve; simply download the app and go flying!