Features: OOTDTY It is a gadget that most too can do without for your FDM-printer: get this, keep away from paper, this allows you to not have to update or change firmware to make use of this in most-case, create a nearly perfect leveled buildplate. How to use it: Put board and cross-under the nozzle in the middle of the bed, Move the Z-down, progressively smaller step, until the light just starts to flicker; Disable your stepper, Move to each corner and adjust them until the light just flickers, Repeat the corner adjustments 2 to 4times until all are set to just flicker without adjustment; Do Z-offset verify the default, You are-done. Does not "pre-set" your z-offset while leveling your build plate. you will still need to assign the proper z-offset in the printer settings. Small part, so when tighten power or replace, please be more patient to operate-it Specifications: Material:ABS Length:Approx.80mm/3.15in for Eneder-3-V2/CR-10 Printer Package Includes: 1xE-Leveler(Battery Not Included) Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.