A must-have gadget for your FDM printer that eliminates the need for firmware updates or modifications in most cases, ensuring a nearly perfect leveled build plate. How to use: Place the board and cross under the nozzle in the center of the bed. Move Z down in gradual smaller steps until the light just begins to flicker. Disable your stepper, move to each corner, and adjust until the light just flickers. Repeat corner adjustments 2 to 4 times until all are set to just flicker without adjustment. Set Z-offset to verify the standard. You're done. This does not pre-set your Z-offset while leveling your build plate; you will still need to assign the correct Z-offset in your printer settings. This is a small part, so be patient when tightening or replacing it. Specifications: Material: ABS Length: Approx. 80mm/3.15in For Ender-3 V2/CR-10 Printers. Note: Please allow 1-2 cm error due to manual measurement. Ensure you don't mind before ordering. Due to differences in monitors, the picture may not reflect the actual color of the item. Package includes: 1xE-Leveler (Battery Not Included)