To determine the penetration resistance with a penetrometer, probe rods with replaceable probe cones are needed. For the offered penetrometers and probe rods different cone sizes are available.

Manual penetrometer: cone tip of 60 degrees for probe cones with 1, 2, 3 1/3 and 5 cm² surface;  cone tip of 30 degrees for probe cones with 1, 2, 3 1/3, 5, 7 1/2 and 10 cm² surface.

Penetrologger: cone tip of 60 degrees for probe cones with 1, 2, 3 1/3 and 5 cm² surface.

Portable on-site penetrometer: cone tip of 60 degrees for probe cones with 1, 2, 3 1/3 and 5 cm² surface; cone tip of 60 degrees for probe cones with 1, 2, 3 1/3, 5, 7 1/2 and 10 cm ² surface.