Spirit bubble level made of PMMA with high optical clarity material; precision machined internal radius; strong and not easy to break; durable, ensures a long life usage. Bubbles can gather within 1 second after impact, and the liquid has strong fluidity; florescent green color, centering with black lines; clearly visible resolution from all sides, easy use, easy to read. Place the level on the place to be measured, wait for the bubble to stand still, observe the position of the bubble; the bubble inside the circle will tell that the tested surface is in water level as the bubble in the exactly middle of the circle. Bubble level can be professional measuring layout and normal usage; also can be adjust office desktop, machine, display, monitors, 3D Printer, devices, woodworking tools, carpentry measuring and other Equipment, etc.