The invention relates to a penetrometer (100) for statically measuring the penetration resistance of ground, comprising at least one central rod (1) ending at a first end in a measuring tip (11) and at least one hollow tube (2) surrounding the central rod (1) and inside which this rod is able to slide. The penetrometer (100) is notable in that the hollow tube (2) comprises: • a first part (21) comprising at least one seal (24) between its internal wall and the central rod (1), • a second part (22) having a diameter (d2) smaller than that (d1) of the first part (21) and into which a fluid (41) is intended to be injected; • at least one expulsion orifice (23) situated between the first (21) and the second (22) part, the said fluid (41) being intended to leave via the expulsion orifice (23).
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