Thank you for the comment!
If factory calibration cannot be executed by user I think it should be removed from the settings.
Can you advice how should I do the factory reset so my readings will be right after I change the clamps to the right phase?
Should I first change the clamps to the correct phase (measurements will be off) and then do a factory reset?
Is there a way to import my saved data after factory reset so I won't lose all previous readings?