soil seedless density meter (EDG) can accurately measure the density, moisture content and compaction degree of the soil in the road and foundation. Feature: 1. Soil model is the combination of soil electronic data and soil physical data input by users, and it is the basis of testing soil parameters in a similar soil characteristic area. 2. For soil modeling, EDG is required to collect electronic signals at different test points (the test points of this soil model are called soil testing). Each test point needs to collect an electronic signal.The maximum dry density of the soil measured in the laboratory is then fed into the instrument so that the electronic data are correlated with the physical data.