Level.Used for surface measurement that the level or not. 3 tube tube placed perpendicular and oblique 45 degrees. The characteristics of this type of tool is aluminum or plastic, approximately one elbow with clear channel, several channels, each channel are the glass with colored liquid inside. The liquid will have a bubble size bean when try moving water. Will notice that the bubbles are moving along. The water level there are many size, mainly by using the size 24 inches (60 cm.) use the size 4 feet (1.2 meters) or 6 feet (1.8 meters) for doors and windows. The water level with a turban (circle) is used to display the key direction of tilt. The use of such tools, look at the water, glass tube which used to measure the horizontal and vertical tube which measure put the water onto the surface to check. See bubbles. If bubbles float in the middle of the glass tube. So the floor level in the horizontal. But if the bubbles are not in the middle. Then tilted to one side. If you want to know any inclined and inclined hard, raise the level of water on one side. And see if bubbles move way, when the bubbles in the middle. Will see that there is a gap between the ground and the edge of the level. And see that the tilt how much. If the floor level, rotate the horizontal level to 90 degrees. Then check again, it is found that the พื้นอาจ are level on one side, but on the other hand, the tilt If the floor level. In all directions, the bubbles will be in the middle of the tube. At every turn to any level
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