The hand penetrometer for top layers is a device that is used to determine the penetration resistance of top layers. Because of the limited overall length of the device, the hand penetrometer can also be used for horizontal measurement, for instance in the walls of profile pits.
The principle of the hand penetrometer is based on measuring the highest penetration resistance of a cone over a distance of about 10 cm. The penetration resistance is measured by means of a compression spring. A number of cones and compression springs are available. A certain combination of a cone and a compression spring is selected based on the expected penetration resistance. If the expected penetration resistance is high, a cone with a small surface is selected and a compression spring with a large maximum force and visa versa.
The hand penetrometer for top layers is, as its name already indicates, specifically used for:
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