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.
OhmApp help you to check if your resistor is available (in the appropriate E series) and the resistior color code. This works of course in both ways. A calculator for your LED series resistor is included. Here you get the next possible resistance and the power dissipation at the resistor. It shows the most important values on a circuit. Of course you are get also defined valuesfor some LED colors.