Characteristic ª Prism less distance measurement for 200 meters, single prism for 5 kilometers. ª Originates 2GB the SD expansion memory stick, the stored datum may reach 5,000,000 spots, provides specialized reads the card. ª The digit, the letter as well as the distinctive mark input fast, a survey function, easy to study easily to use. ª The ultra large capacity procedure storage space, the preassemble rich survey application procedure, satisfies the different user each kind of specialized demand. ª It can carry on the coordinate survey, the setting-out survey, the resection, the opposite side survey, to hang the high survey, the area computation, the bias to survey. ª The large capacity lithium electricity rechargeable battery, the operating time is 20 hour.