Kolida Fengyun kts-491 high-precision total station, which is the work of domestic total station, creates the highest accuracy of domestic total station, and the angle measurement accuracy reaches 1 ", ranging accuracy is ± 1 mm + 1 ppm, prism free mode is ± 3 mm + 2 ppm, and the angle measurement and ranging accuracy is upgraded. The software platform can load a full range of wizard software (tunnel survey, mapping wizard, engineering wizard, control wizard, house spirit, highway spirit, pipeline spirit, survce) * good weather: cloudy day, breeze, no fog, visibility of about 40km