Details Penetrometer
The penetrometer consists of removal tapered-tip cone, a rod with depth marks at 3″ (7.5cm) intervals, a machined precision-bore pressure chamber, and a 0-1000 Psi (0-60 bar) pressure gauge. The diameter of the bore / piston and tip cone base are essentially equal. This means that the pressure reading of the meter is approximately the same as the pressure required at the tip to force the rod through the soil.
REMINDER: Soil must be moist in order to obtain meaningful readings