High precision theodolite | Jinke Instruments (certified) | theodolite provided by Qingdao Branch of the Instrument Co., Ltd.. Instrument Co., Ltd. Qingdao Branch (www.qdjk17.com) is specialized in the "mapping equipment, analysis equipment, testing equipment, flow meters, optical instruments, temperature instruments," the enterprise, the company adhering to the "honesty, hard service" philosophy, to provide you with the highest quality products and services. Welcome to inquire! Contact: Li Yongjie. Some construction projects on the site, we will often see a number of technical personnel strapped measurements during a single instrument, the instrument they use is the theodolite. Theodolite initial invention has a close relationship with the sailing. In the 15th and 16th Centuries, some developed countries produce theodolite Britain, France, etc., because of sailing and war, the need to draw a variety of maps, charts. First mapping using laser theodolite triangulation is based on high precision theodolite observations on two known points, the third point of the distance determined position, but the absence of suitable devices theodolite, resulting in limited angle measurement means accuracy is not high, thus rendering a topographic map of the main components of high accuracy is not a single parallel plate micrometer reading device single parallel plate micrometer are: single parallel plate glass, fan-division scale and micrometer wheel and so on. This instrument dial grid is 30 ', the sector division on a 90-foot small grid, the grid is 30' / 90 = 20. "When measuring angle rotation when targeting micrometer wheel, double index line After clamping the dial points crossed image reading integer degree readout dial according clamped sub scribe, inadequate entire degree from the measured differential draw foot section reads.