Features 1、Green color, centering with black lines, clearly visible resolution from all sides, easy to read. 2、The bubble inside the circle will tell that the object surface is level as the bubble shows in the middle of the circle. 3、High optical clarity material, high transparency, three‑line design, more accurate measurement. 4、The handy small pocket sized is perfect for quick use anywhere, makes more convenient and accurate. 5、Mini level ruler auxiliary tool platform balance ruler is suitable for 3D printer series leveling detection. Specification Item Type: Level Bubble Ruler Material: ABS Product Function: Used for 3D printer leveling detection Package List 2 x Round Ruler 2 x Cylindrical Ruler 2 x Cuboid Ruler