Hi, right now MoI does not have any way to specify what unit system is being used. 
 
It just uses the concept of a generic unit. You can decide that this is whatever you like, cm, mm, inches, whatever, just as long as you treat it in a consistent manner between different files that you create. 
 
But I do plan on adding in a proper unit system setting like you are looking for fairly soon though. 
 
    - Michael 
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