[Wide Application]:3D printer professional auxiliary leveling is suitable for all heated beds with adjustable nuts. (Not suitable for stationary heated beds). [Precise Leveling]:Level the heat bed without sliding back and forth with A4 paper. There is a green light on this leveling tool (GLA10). When the nozzle touches the circuit board, the light turns on. The GLA10 quickly and accurately down the bed on the same level. and easier than A4 paper. [Easy to Use]:Put this GLA10 leveler directly between the nozzle and the heated bed, adjust the nut according to the indicator light to level quickly. [Time-Saving Leveling]:Align the nozzle with the GLA10 3d printer leveling crosshairs and adjust the leveling nut to match the position of the nozzle. When the green LED on the GLA10 lights up, the hatch is upgraded. Note that the GLA10 only lights up at the four corners of the heat bed. [Reminders]:1.Insert the included CR2032 battery into the GLA10's battery holder. Please be careful not to install the wrong polarity when installing the battery.2.Please clean up the residual filament on the nozzle, so as not to affect the leveling accuracy. Colour:Blue Material:PC board circuit board Size:11.5x7..2CM Package Contents: 1 * Auxiliary leveling device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.