* It has no radiation, nuclear contamination, and is cheap, small and easy to carry in the field. * Penetration method a group of tests up to 15-20 minutes, high efficiency, fast, productivity liberation. * It is used in domestic industrial and civil construction, highway, railway, road and bridge, municipal drainage, oil pipeline, water conservancy, dam construction, dike, irrigation canal, reservoir construction, airport runway engineering. * Universal type penetrometer is based on the geotechnical experiment: the penetration of soil and the dry density of soil, the relationship between the relationship between the penetration and water content of soil and the relationship. * The regression equation, the rate of penetration resistance between the dry density and the related data sheet. By measuring the penetration resistance and looking up the table, the dry density can be quickly obtained, and then the compaction., Manufacturer: CFWWSAQ