On average, it takes 5-7 attempts to become comfortable using the front-facing camera. There are 3 tips that are important to understand before mastering the Comb Scanner. Like all scanners, Comb has its technical quirks and nuances. Remembering these three tips will help you obtain high-quality scans every time.
Always keep the body part on the screen, or tracking may fail.
If the patient moves significantly, tracking may also fail.
After beginning a scan, scan freely 6-21" (15-53 cm) away from the body part. Dark spots will appear if you're too close.
For a complete outline of the Comb Scanner's tips-and-tricks see the following video: