The electric density gauge strictly enforces national standards and is an instrument for measuring the density and compaction of hot mix asphalt pavement. Electric density gauge adopts electromagnetic induction technology instead of nuclear source radiation method, low cost, high safety, users do not have to worry about the cumbersome EIA application, time-consuming training, and harsh transportation control. With simple calibration, high accuracy, repeatability, and touch screen operation, the electric density gauge allows users to complete relevant operational training and master the techniques of on-site quality inspection in a short period. The electric density gauge can quickly measure the road separation, low density, uneven areas. Next is an introduction to the use and precautions of the Densitometer.