Calibration will be prompted at every device/app connection. If the app does not automatically ask you to calibrate your device, you can manually initiate this action by going to “Settings” (It is the icon in the upper left hand-side of the app) and then going into the “Manage Device” section.
You will be prompted to scan the two calibration tiles that came with the Spectro 3.
Once calibration is complete, you’re ready to scan.