You'll order a dongle (a small device to be plugged into an USB port on your computer) which contains the right of use for the audio-measurement-app SATlive (www.satlive.audio) and the right of use for the level-monitoring and logging app LevelCheck.
This dongle will allow you to operate the apps on the pc where it is currently plugged into an USB port.

The app SATlive is an audio - measurement app based on Dual - FFT measurement. It runs on windows(R) based computers and targets to the measurement and optimization of PA - systems.
Beside other measurements the app supports transfer - function measurement, impulse - response measurement, FFT and RTA32 display and oscilloscope simulation. 

Use this link for further information about SATlive.

LevelCheck offers SPL monitoring and logging.
Please note that LevelCheck contains a German manual only, but you can toggle the GUI - language between German and English.