To measure a circumference on the image like an oval shape, use the Ellipse measurement tool.
- While scanning, freeze the image by tapping on .
- To start measuring, tap on and choose .
- Tap at one end of the area that you want to measure and tap to the other end of the desired area. Adjust measurements by dragging the purple circle of each point.
- Once you have completed your measurements, tapto save the image.
- Tap on the right arrow on the bottom right corner of the app to go to the Review page. You will see all the measurements here.
For more information see this video.