To determine the penetration resistance with a penetrometer, probe rods with replaceable probe cones are needed. For the offered penetrometers and probe cones different rod sizes are available.
 
Manual penetrometer: Ø 8 mm for cones with 1 cm² surface; Ø 10 mm for cones with 2 cm² surface; Ø 15 mm for cones with 3 1/3 bis 10 cm² surface.

Portable on-site penetrometer: Ø 8 mm for cones with 1 cm² surface; Ø 10 mm for cones with 2 cm² surface; Ø 15 mm for cones with 3 1/3 bis 10 cm² surface.