GE Vscan Air Manual page 164

Vscan Air Configuration (for iOS and Android)
Configuration (continued)
4-12
12. Display calibration (see 'Configuration' on page 4-3) - The
images can be used to adjust the brightness level of the
device, so that a full range of grey scale level is visible. It is
recommended to turnoff adaptive brightness and color filters
on the device.
Figure 4-13. Display calibration
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Vscan Air
Direction GP092020-1EN Rev 18
User Manual