Horizontal ruler is a measuring instrument that uses the principle of liquid level to directly display the angular displacement by level bubble and measure the relative horizontal position, plumb position and tilt position deviation degree of the measured surface.

The horizontal ruler with level bubble can be used for inspection, measurement, scribing, equipment installation, construction of industrial engineering; it can be used for both short distance and long distance measurement, and also can solve the measurement of narrow area, with a wide range of use scenes, easy to carry, high accuracy and economic application.

In use, in principle, the horizontal and vertical level is in the center, and the blister with angle is also naturally in the center. When you put it on the object to be measured, the water bubble is biased to which side, it means that side is high, that is, you need to lower the height of that side, or adjust the height of the opposite side; the water bubble shows in the center, it means the object to be measured is horizontal in that direction.

Horizontal glass tube used to measure the horizontal plane, vertical glass tube used to measure the vertical plane, the left glass tube is generally used to measure the 45 degree angle, the water bubble in the center is horizontal, the water bubble is off-center, the plane is not horizontal. Note oh: according to the principle of two cross lines to determine a plane, need the same plane within two non-parallel position measurement to determine the level of the plane.

Level ruler precautions before use with non-corrosive gasoline to wash the level of the anti-rust oil, and wipe clean with degreasing cotton yarn. When using 1. pay attention to the temperature change. It must be isolated from heat source and wind source. If the temperature of using environment is different from the temperature of preserving environment, it is necessary to put the level ruler on the flat plate to stabilize for 2 hours before using, which will occasionally make the measurement error; 2. The level ruler must be placed smoothly when measuring, the water bubble should not swing, and the bubble must be completely still before reading. After use, the surface of the level must be wiped clean and coated with water-free, acid-free anti-rust oil, placed in a clean and dry place for preservation.