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 trajectory6.2.8 inch large color screen that makes more clear and visually.7.Efficient startup: 30sec for cold boot, 3sec for warm boot. Technical indexes:NF-198Color Blue + GraySquare detect range 0-999999.9 MMeasuring error 3-5%Units mu/ square / hectare / kilometresLength detect range 0-999999.9 MMeasuring error 1-3 MPower supply 3.7v / 2000mAh batteryContinuous working time 8-10 hoursDimensions (LxWxD) 174 x 76 x 28mmWeight 149gAttention: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. Reminder: Due to limitations on Google Maps, data cannot be exported to a computer, and the functionality and model NF-188 are the same product.