The pocket penetrometer is regared as a simple tool to
aid the engineers in field exploration and in checking
and comparing similar types of soil, but it can never
be used to obtain foundation design data.
This light weight penetrometer is used in the field for
classifying cohesive soils in terms of consistency and
estimation of approximate unconfined compressive
strength and shear strength.
In operation, the stainless steel cylindrical tip of 0.31
cm2 area is pushed into soil so as to penetrate up to 6
mm marked point. A cursor on the scale reads directly
unconfined compressive strength in kg/cm2.