Angle measurement is an important part of geometric measurement. The range of angles is very wide. Plane Angle can be divided into water plane Angle (or azimuth Angle) in horizontal plane and vertical plane Angle (or inclination Angle) in vertical plane, while space Angle is the synthesis of water plane Angle and vertical plane Angle. According to the range can be divided into circular indexing Angle and small Angle; According to the nominal value can be divided into fixed Angle and arbitrary Angle; According to the element unit can be divided into line Angle and plane Angle; According to the formation method can be divided into fixed Angle and dynamic Angle, fixed Angle refers to the processing or assembly of parts after the Angle, and the instrument returns to the static Angle position after rotation; Dynamic Angle refers to the Angle of an object or system in the process of motion, such as the Angle between the satellite orbit and the earth’s equator, the Angle between the earth’s surface, the axis drift of the precision equipment’s spindle rotation, and the Angle signal output in real time by the Angle measuring equipment when it moves at a certain angular speed and angular acceleration.

Tilt sensors are also called tilt gauges, tilt gauges, horizontal gauges and tilt gauges. They are often used to measure changes in the horizontal Angle of the system. Levels range from simple bubble level gauges to electronic level gauges, which are the result of developments in automation and electronic measurement technology. As a testing tool, it has become an indispensable measurement tool in bridge erection, railway laying, civil engineering, oil drilling, aviation navigation, industrial automation, intelligent platform, mechanical processing and other fields. Electronic level is a very accurate measuring tool for small angles. It can measure the inclination of the measured plane relative to the horizontal position, the parallelism and perpendicularity of two parts to each other.