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Let’s determine your screen’s dimensions. Then we can accurately measure your ring size.
Place a ruler on the screen according to the template below. Use the + and - buttons to adjust the markings until the PointA and PointB match 10cm on your ruler.
Place your ring on the circle below. Use the + and - buttons to
adjust the size of the circle until you can’t see any circle within the ring.
You’ll know you’ve adjusted correctly when you don't see any circle inside the ring.
Click “Apply” when you’re finished.