Level is to measure the height difference between the ground point of the instrument based on the principle of leveling. Level is 17 to the 18th century invention of the telescope and the vial after appearing. Early 20th century, the production of micro-focusing binoculars and pour water level is in line with the standard system out basis. The 20th century, in the early 1950s there has been automatic levelizer; 1960s developed a laser level; 90s electronic level or digital level. Automatically by means of a water level automatic levelizer Anping get eye level of compensation. It is characterized mainly when the telescope line of sight with a little tilt compensator under gravity relative movement of the telescope, which can automatically and rapidly obtained when the scale reading at eye level. The basic principle of compensation is: When the telescope eye level Level agents, the main point of the objective lens with a high standard object point on the scale of the image point P constitute Z0 should fall on the intersection of the crosshairs Z. When a small telescope on the horizon tilt angle α, the crosshair intersection Z moves up, but like point Z0 is still in place, so that reading produces a poor Z0Z. When the pitch is small can be considered as Z0Z α × f '(f' is the focal length of the objective lens), then in the light path can be equipped with a K-point compensator domestic water level, so that the light generated inflected angle β, satisfying α × f '= β × S0 (S0 for compensation to the distance from the center of the reticle that KZ) Level measurement under conditions, such as the Z point Z0 falls; or make the instrument crosshairs automatically swing the opposite direction, the intersection of the crosshairs Z off On Z0 points. Auto Anping Level measurement can be achieved in three main areas. Are the height measurement, distance measurement, angle measurement direction. And we are usually used to measure height, the following describes how to make use of automated levelizer height measurements. _ _ Electronic Level Level Branch of the Instrument by Instrument Co., Ltd. Qingdao Branch. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) strong, credible, in Qingdao, Shandong analytical instruments industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Branch of the Instrument and you hand in hand into the brilliant, for a better future!