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I am having exactly the same problem.
The file comes from the architect and has some sizes but I need to know others and also certain areas.
When using the measuring tool it shows 71.71 units ( I say that because if I choose mm it says 71.71 mm, if I choose meters it says 71.71M !!).
Although it will measure an area it is not correct.
This is causing the programme to be pretty useless - and I was considering in upgrading - not at the moment though!
This is exactly the same for both PC and phone versions.
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