The pocket penetrometer is regarded 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 oil so as to penetrate up to 6 mm marked point. A cursor on the scale reads directly unconfined compressive strength in kg/cm2.

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