Instructions:
- Check the calibration square below to ensure it measures 100mm x 100mm when printed
- If it doesn't match, check your printer settings and set scale to 100% (no scaling)
- Place an existing ring that fits well over the circles until you find a perfect match
- Alternatively, wrap the paper sizer around your finger and note where the arrow points
Important: For accurate results, verify that the calibration square is exactly 100mm x 100mm.