Pocket penetrometers are commonly used on split spoon and thin walled tube samples to evaluate consistency and approximate unconfined compressive strength of saturated cohesive soils. They may also be used for the same purpose in freshly excavated trenches for the same purpose.
Pocket Penetrometers have sliding scales marked in kg per square cm and TSF (i.e., 1 kg/cm2 = 1 TSF) and are supplied with a carrying pouch, operating and calibration instruction sheet. There are three models: the S-170 has a Delrin body and laser etched markings on the sliding scale, the S-170A has a Delrin body and machine engraved markings on the sliding scale; and the S-170B has a nickel plated body and laser etched markings on the sliding scale. An optional foot adapter is available for use with all models. This increases the piston area 16 times for use in very soft clays.