Features: Brand new and high quality Professional auxiliary leveling for FDM 3D printer is applicable to all heat beds with nut. There is a green indicator on this levelling device (GLA10). When the nozzles touches board, light will light up. GLA10 can quickly and accurately bring the bed to the same level. Place this GLA10 leveler directly between the nozzles and the heat bed and adjust the nut according to indicator light for quick leveling. Aligned the nozzles at the crosshairs of the GLA10 3D printer and adjust the leveling nut to the position of the nozzles. Make sure the GLA10 light up straight on all four corner of the hot bed. Insert battery into the GLA10. Please make sure not to install the wrong positive and negative poles when installing the battery. Specifications: Material:PCB Size:Approx.9x3.5x1.2cm/3.54x1.37x0.47inch Package Includes: 1x Leveling Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.