cdl-3 static penetrometer applicable to general cohesive soil, soft soil, loess and sand area in civil engineering and construction engineering, municipal, highway, foundation soil in situ test, used to find out the formation change in vertical and horizontal direction; layered with mechanics. technical parameters: penetration resistance:30kn penetration depth:20m-30m injection speed:0.5-1m/min the probe of section:l0cm2,15cm2