Park the cursor on the square. Then hold it there
Drive the cursor with the right stick, the way you would place a chest or a path tile. It counts when you have held it inside the square for 300 ms, which is the half of this that placing furniture actually needs. 4 attempts before the numbers mean anything.
Drive the cursor onto each target with the right stick and hold it there.
Save the numbers to your private Device Passport in this browser, or copy a card that shows exactly what was measured.
Nothing is uploaded unless you contribute. Cards and links contain only the numbers shown above.