This is the main window of ProKon where you are supposed to specify the unit you want to convert. 

When the units you need are not displayed, you can add them by entering the names of the units and the conversion factor. 

The Preferences menu of ProKon will offer you quick access to its main functions, including customizing the color selection. 

This is an example of the way a conversion will take place: choose a unit, specify the value, then select the output unit. 

In order to better understand the conversion factor, you can choose to visualize a relevant graph. 

ProKon offers you the possibility to configure the graph options according to your preferences and necessities.