Template:Modeling polygons distance tool
From TOI-Pedia
Sometimes you need to know the exact distance or size of something, it can be convenient to use the distance tool for that. The distance tool can be found under Create > Measure tools > Distance tool. The distance tool measures the distance between the two points you specify by clicking in your view port. Using point snap can be really useful when doing this. If you move one of the pointers afterward with the move tool the distance is updated automatically.
