The device has two probes provided identical to an apparatus described by a standard. One of the probes is provided above, and the other probe is provided below a main probe in a drilling direction. The two probes are arranged on both sides of a central probe to contain tested soil. The two probes are fed from a pressure-volume controller by a pipe for water and another pipe for gas. The pipes are connected to the two probes. The probes are connected by silent-block type rubber rings. The central probe is fed by the pipes.
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