Hey, first off, the Dimensions are shown in the panel - you can see them in your screen shot - scale is ok (all 1’s). Second - and the real answer to your question is - you are in ‘Perspective’ veiw - as in you are looking at the object how the cameras focal length is… DO NOT do that when measuring something, that is why your measurement does not coincide with the ‘Dimensions’ box, use ‘Ortho’ veiw. One last thing - why would you be changing the ‘Scene Scale’ to such extremes ?? If you are modelling precion stuff, then I would check out Clockmender’s PDT add-on
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