The theodolite invention improves the accuracy of the angle of observation, while simplifying the process of measuring and computing hardware theodolite, but also provides a more accurate mapping data. Later theodolite is widely used in the construction of the measure. Theodolite consists of three parts of the base, dial (horizontal circle and vertical dial) and alidade. Base used to support the entire instrument. Horizontal circle for measuring horizontal angle. There telescope alidade, standard pipe and reading devices, etc. Targeting and electronic theodolite readings: ① eyepiece light: eyepiece focus to make the reticle clear. ② aim and objective light: coarse pointing theodolite price target, the target clearly focusing lens. Note eliminate parallax. Fine pointing targets. ③ reading: Adjust the lighting reflectors, so moderate reading window brightness, rotation reading microscope eyepiece makes clear scribe line, and then reading. The method of optical theodolite readings dial readings system includes several components of horizontal and vertical dial, micrometer device, reading microscope. The minimum value of the grid plate horizontal circle and vertical dial on the characterization is generally 1 ° or 30 ', read a cell value is less than the value of the angle, the device must use the micrometer readings measured DJ6 grade optical theodolite Micro-device has micrometer and two kinds of parallel glass micrometer. Theodolite use, Jinke instrumentation (certified), provided by theodolite Instrument Co., Ltd. Qingdao Branch. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) is Qingdao, a leader in analytical instruments, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Branch of the Instrument in leadership with the staff warmly welcome all inquiries negotiations to create Branch instrumentation a better future.