Measuring horizontal and vertical angles of the instrument. By the British mechanic Sisson (Sisson) first developed in about 1730, the latter forming the improved laser theodolite, the official British geodesy. 1904 Suzhou theodolite, Germany began production of glass dial theodolite. With the development of electronic technology, the emergence of electronic theodolite 1960s. On this basis, theodolite, 70s made electronic speed measuring instrument. The method of optical theodolite readings dial readings system includes several components of horizontal and vertical dial, micrometer device, reading microscope. Dial horizontal circle and vertical dial on the characterization of the smallest cell value is generally 1 ° or 30 'production theodolite, when reading the angle value less than the value of a cell, requires the help of a micrometer device, DJ6 grade optical theodolite micrometer reading device has micrometer and two kinds of parallel glass micrometer. Performance parameters: Effective range: 200m Minimum reading: 1 "/ 5" angle measurement: Photoelectric incremental effective aperture lens: 45mm Magnification: 30X Field: 1 ° 30 'Imaging: As Minimum sight distance: 1m goniometer Accuracy: 2 "Compensation range: ± 3 'Data Interface: RS-232C wavelength: 635nm Spot size: 5mm / 100m Battery: 4.8V Ni - MH batteries or 4 AA alkaline batteries theodolite theodolite price _ _ Branch of the Instrument provided by Qingdao Branch of the Instrument Co., Ltd. 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 innovation and continuous improvement philosophy will lead Branch of the Instrument and you hand in hand into the brilliant, for a better future!