Three steps to read any gyro ring disc
■ Inner · slit · ■ Outer
Live demo — 19 sec · Download video
Open the scanner and point the camera at the disc from directly above.
The horizontal slit should cross all eight rings.
Drag the ■ Inner handle to the inner edge of the
rings, and the ■ Outer handle to the outer edge.
Tap ⊙ to freeze the image when the disc is steady.
Once frozen, drag the ■ Inner handle so it sits
exactly at the inner boundary of the first ring, and the
■ Outer handle at the outer boundary of the
last ring.
Watch the zoomed strip and the 8 cells below — the decimal value
updates in real time as you adjust.
The decimal value is shown live at the bottom of the screen. Once you're happy it's correct, tap Show in Calculator to open the ring calculator with the value pre-loaded — ready to add a second or third disc.