E640 is a new generation high-precision static measurement system developed by Hezhong Sizhuang. It features an integrated design that combines GPS antenna, GPS receiver, lithium battery, and data storage. The system has excellent performance in tracking multiple GPS satellites, and it is waterproof, dustproof, and shockproof. It is easy to operate and has a large storage capacity. It can be widely used in control measurement, engineering measurement, GIS data collection, cadastral survey, and area measurement.