AD was founded in 1994, it&＃39;s business covers Survey/GPS, water industry and sea industry, possesses the market share of more than 35% and becomes the biggest supplier for Survey/GPS in China. (a high-tech and share holding company, and headquartered in Beijing, with one subsidiary branch in U. S. A, three subsidiary branches and five offices in China, with after-sales domestic service center and domestic maintenance center. Now AD is becoming a multinational group with the business scope specialized in many fields, such as surveying mapping, navigation, communication, environment, etc.Is Trimble&＃39;s world No.1 distributor, and have good relationships with some other world leading surveying and environmatal Company. )As the manufacturer and exporter of optical and laser surveying instruments and accessories. Its products range from auto levels, digital theodolites, construction lasers and total stations to tripods, leveling rods, prisms, poles, measuring tools and safety equipments.With strong manufacturing capabilities, AD is not only manufacturing products carrying the brand name of AD Survey, but also is making OEM products for other companies in the industry. With a distribution network and service centers throughout the world, AD provides on-time service and prompt technical support.Known for quality products and competitive prices, AD is committed to providing economic solutions to surveyors, contractors and engineers.