Features Specifications:Portable Area Meter, lab equipment  Portable Area Meter, lab equipment, it can test farmland, green land, forest, water area, tidelands and so on regular&irregular area. When regular you can test the area by several points; when irregular you can walk follow the area border, then the instrument automatic count. Unit is square meter & Chinese acre. It also can test distance and perimeter. You can input price, you can count sum of money immediate. You can find the number of satellite, it show the precision to us. The number of satellite is more than the result precision is higher. Specification:  Measuring range: 1-60000 chinese acre;500-9999999 square meter(1 chinese arce= 666 square meter.)  Measuring distance range: 0-999999.9m  Test unit: meter, square meter&chinese acre  Precision:1-10 chinese acre; above 10 chinese acre +1% Stored datum: 2000groups