Function Features: 1.Measure area and length of any shape (containing mountainous land, slope and flat field). 2.Can display measuring value, figure track and automatically calculate price after measurement. 3.Vehicle-carrier measurement, distance can be adjusted according to needs. 4.Test data , Graphics trajectory can be exported for printing. 5.Applicable google map shows real graphics trajectory 6.2.8 inch large color screen that makes more clear and visually. 7.Efficient startup: 30sec for cold boot, 3sec for warm boot. Technical indexes: NF-198 Color Blue + Gray Square detect range 0-999999.9 M Measuring error 3-5% Units mu/ square / hectare / kilometres Length detect range 0-999999.9 M Measuring error 1-3 M Power supply 3.7v / 2000mAh battery Continuous working time 8-10 hours Dimensions (LxWxD) 174 x 76 x 28mm Weight 149g Attention: 1. Don't close to tall obstructions ( building , tree something like that ) because this device fit to ourdoor empty test. 2.After searched 6 satellite to start work. 3.Don't measure le than 0.3 mu land. 4. Don't cro or overlap the trajectory when you measuring. 5. Before you measuring , please check the Latitude and longitude coordinates is steady.