Su optical theodolite, Jinke instrumentation (certified), theodolite provided by Instrument Co., Ltd. Qingdao Branch. 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. Theodolite structure (primarily common parts): 1. 2. Telescope telescope brake spiral helix 4. 3. telescope fretting level brake 5. 6. foot level micro-helix spiral optical sight 10. 9. focusing lens 11 The eyepiece focusing dial reading microscope 12. 13. The vertical index focusing vial jog spiral 14. 15. The base optical plummet Circular level instrument base 17. 16. 18. Vertical Vertical dial dial illumination mirror 19. alidade level vial 20. transform handwheel dial position measuring horizontal and vertical angles of the instrument. By the British mechanic Sisson (Sisson) about in 1730 developed the first theodolite sales, improved after molding industry theodolite, an official for the British geodesy. 1904 theodolite, Germany began producing glass dial theodolite. With the development of electronic technology, the emergence of electronic theodolite 1960s. On this basis, the 1970s made electronic speed measuring instrument.