Theodolite is a telescope's mechanical parts, so that the telescope can point in different directions. Theodolite has two mutually perpendicular shaft to adjust the azimuth and horizontal telescope height. Such simple theodolite gantry structure, low cost, mainly with ground-based telescopes (geodesy, bird watching and other purposes) to use, if used to observe celestial theodolite rental, due to the direction of motion of celestial bodies day week is usually not perpendicular or parallel to the horizon, so need to turn the two axes and transform over time to track celestial theodolite speed sales, but the field of view of the other days experience relative to the target celestial body rotation, unless coupled with offsetting mechanism to rotate the field of view, or not suitable for long exposure astrophotography . Performance parameters: Effective range: 200m Minimum reading: 1 "/ 5" angle measurement mode: Optical Incremental effective aperture of the objective lens: 45mm Magnification: 30X field of view: 1 ° 30 'Imaging: As a 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 electronic theodolite, theodolite, Jinke instrumentation by Instrument Co., Ltd. Qingdao Branch provides 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. Companies working attitude and excellence continuous improvement of innovative ideas will lead Jinke instrumentation and you work into the brilliant, for a better future!