Hebei Zhufeng Apparatus Meter Limited Company, being a director member of China surveying and Mapping Association, is the biggest manufacture that researches, produces and manages the accurate instruments and apparatus, the automatic controlling equipments and mapping devices in North China. The brand of our company, Zhufeng, has been a famous one in Hebei province. Our company is one of the national key new products enterprises, obtaining more than one hundred inventions and patents at home and abroad. And our firm is honored by ISO9001 quality control system authorization. Used widely in the projects of all kinds of fields, such as mapping, measuring, geology, metallurgy, mine, hydrology architecture and military, the productions have been reliable and the first choice by the customers by hone and abroad, due to its superior qualities and its outstanding services. Our company is a province-grade station for appraising instrument, owning advanced surveying equipments and professional crews for measuring and repairing. The precision of our dual-frequency laser interferometer has reached the leading position at home.