pocket soil penetrometer:

The pocket penetrometer is specifically used to determine the penetration resistance of top layers (measuring depth 5 mm) and of samples in the field or in the laboratory. When pushing the instrument into the ground, the pin encounters a force of the ground. The spring is compressed by this force. A slip ring is taken along during this operation, which shows on the scale the maximum force that has been encountered. The scale has been calibrated in such a way that The pocket penetrometer is specifically used to determine the penetration resistance of top layers (measuring depth 5 mm) and of samples in the field or in the laboratory. When pushing the instrument into the ground, the pin encounters a force of the ground. The spring is compressed by this force. A slip ring is taken along during this operation, which shows on the scale the maximum force that has been encountered. The scale has been calibrated in such a way that the penetration resistance that has been encountered can be read on it immediatelythe penetration resistance that has been encountered can be read on it immediately.

Designed for making field classification of cohesive
soils in terms of consistency, shear strength and
approximate unconfi ned compressive strength.

Two models available:
16-T0171 standard model, measuring range 0 to 5 kgf/cm2
Dimensions: 20 mm dia. x 173 mm length
Weight approx.: 0.5 kg
16-T0163 Heavy duty model, all stainless steel construction, 

three interchangeable tips: 4.5 mm dia.for very hard soil, 6.35 mm for medium and soft soil,
8.98 mm for soft soil. 

Supplied complete with plastic case.
Measuring range: 0 to 10 kgf/cm2
Dimensions (assembled): 210 mm length x 20 mm dia.
approx.
Weight approx.: 0.5 kg