Femtek Sizer app for iPhone and iPad
Say goodbye to printing charts, measuring with a string, or unsustainable plastic sizing kits.
Simply place a ring that you wear on your index finger on the screen, and adjust the slider until you find the right size for you!
Further instructions and troubleshooting can be found at http://www.femtek.co/faq/
subtitle (caption that is visible under app name on App Store): Femtek BBRing sizing app! Say Goodbye to guessing your size!