If the estimated Specific Gravity measurement reported by Plaato Airlock has a wide variance from a measured Specific Gravity of your brew, you can manually update the SG in your Plaato App:
Launch your Plaato App
On your home page, Tap on the Plaato Airlock device you want to update
Tap on "Update SG" in the top navigation menu
Click on the drop down menu under "Manually update Specific Gravity"
Enter in the measured SG Value
Click on "Learning On" so your Airlock will start to learn and move close to the entered value.
If you do not want your Airlock to learn from your manual update click on "Learning Off"