The Custom System of Units is fully customizable by the user. A variety of units is offered for each unit category, for the user to select from.
Tip: You can first select a predefined system and then you can click "Custom". This will "unlock" all the unit fields and then you can choose whatever you want.
Note: Units cannot be left empty, with the exception of the last 2 (Strain and Utilization Ratio) which are unitless quantities. On the other hand, if ALL units are empty, this is acceptable as this is the definition of the Consistent System of Units. In other words, either ALL units can be empty (i.e. Consistent System) or no units can be empty (with the exception of the last 2).
Custom System of Units