You apply an equation to the selected channel and choose a correct Unit for the equation.
For example, you can select Linear equation in the Configuration Dialog of the logger:
And click “Edit Linear Equation” button to show the equation dialog. Fill out the necessary fields and change a Unit of your choice:
If Unit is not in the list, you can create your own Unit from Unit Category dialog launched by clicking this button:
Please refer to this FAQ for details of adding a new unit:
You can also write your own custom equation and use it in a channel. Please refer to this FAQ for writing a custom equation: