Stable and Protable Design: The ZL166 surveying gps is waterproof, dustproof, and fall-proof, which ensures its stability and durability when used in different terrains. Simple and easy to operate and only 180g in weight,fits in your pocket perfectly,east to carry High Accuracy: Great support GPS, GLONASS, BEIDOU Navigation Satellite System, super strong signal, provide instant and precise positioning, with high- technology, small area measurement error Large LCD Screen: The ZL166 land surveying equipment has a 2.4 inch large color screen with a backlight display, the measurement results can be displayed on the screen directly, more clear and visually Multiple Measurement Methods: Supports 2 types of area measurement methods that can measure any regular or irregular area,and 2 distance measurement that can measure straight line and curve diatance.Please measuring after searching for satellite signals in an open area, Manufacturer: Aundhegrtt