This tool helps you level your bed manually to make it approximatly horizontal.
If the bed is hot, the following panel appears:

- This is to avoid burning the surface of the bed when the hotend is hot.
Press Back to cancel the action and go back to the previous panel.
Press Next to continue.
The following panel is displayed:

- Tap one of the buttons with a number to go to each position
- Adjust each thumb nut so a feeler gauge (0.1 mm) can move between the nozzle and the bed with just a tiny bit of friction:

- If you do not have a feeler gauge, you can also use a sheet of paper but it is less accurate.
- Tap the 5th button to check that your leveling is good. Tap any of the other button to level again the corresponding corner.
- Once you are satisfied with the leveling, tap the Back button.
Note: A feeler gauge is cheap and you can buy one for a few dollars on Amazon, Banggood, etc.
