ASTM D 1558
Main features
  • Scale graduations from 10 to 130lbf
  • Threaded needles are interchangeable
General description

The Proctor Penetrometer is used for determining the penetration resistance of fine-grained soils.

The unit consists of a special calibrated spring dynamometer with a pressure-indicating scale on the stem of the handle.

It comes with a stainless steel adapter stem for larger needles.

The pressure scale is calibrated to 100 lbs. by 1 lb. subdivisions. There is a major division located at each 10 lb. interval.

A sliding ring on the stem indicates the maximum load obtained during the test.

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Technical specifications

Ordering info

SL 0112 Proctor Penetrometer complete set with needle point.


SL 0112-1 Set of spare needle point (0.25, 0.5, 1, 1.5, 2, 3, 5, 6 cm2)