This app works on mobile devices only. Scan the QR code to access it.
Attach a part of any card here, then adjust the size using the slider so that only the black frame is visible Important! The card is for calibration only; no card data is read/used.
Place your ring on the screen and adjust the circle size to match it with the line tracing the inner surface of the ring.
Check Your size is ...
|INTERNAL DIAMETER OF THE RING (mm)||15.3||15.7||16.1||16.5||16.9||17.4||17.8||18.2||18.5||18.9||19.4||19.8||20.2||20.68||21.08||21.49||21.89||22.33|