Question about Rhino file dimension

Is there a way to find out what dimensions are being used in Rhino file.

I alway use Small millimetre and it is my default. I am working on a model that I have to use SAE & Metric, so I have all my formulas for ⅛" inch - 3" etc…

When I brought in an old model that is 26 mm high in original file, it came in as 2.6mm.

So how can I find out what is a files default dimension. I have my formula and custom suffix to give me mm & inches, so that is not helping.

Thanks, Randy

Draw a line and analysis it’s length …