GRAIN MOISTURE METER Can test the open door leaves area with not damage. Easy to carries. Can test many kinds of data, such as leaf area, average area, length of leaf, width of leaf, thickness of leaf, perimeter and ratio of Length to width. Specification :  Measuring range : leaf area, average area, length of leaf, width of leaf, thickness of leaf, perimeter and ratio of Length to width. Test unit: Millimeter, square millimeter Precision : + 2%  Length : _1000mm Width : _160mm Thickness : _8mm Stored datum : 200Groups Battery : 6V Model: Model : LAW-A Standard Model : LAW - B add Computer interface, can import data directly to the computer printing, storage.