AS PER ASTM D 1558 D 2573.


  • Proctor needles are used for quick evaluation of maximum soil density in the field.
  • Standard Compaction curves showing moisture contents versus densities are drawn in laboratory using standard compaction method and penetration of the proctor needles are correlated.
  • Proctor Needles are also known as Proctor Penetrometer.


General Description and Specifications: The instrument consists of

  • A needle attached to a spring loaded plunger, the stem of which is calibrated to read 0 to 40 kg division. Long stem is graduated at every 12.5 mm to read depth of penetration and for use with needles of larger areas.
  • The small penetration stem is also graduation in 12.5 mm division and is used with needles of smaller areas.
  • Needle points one each of 0.25, 0.5, 1.0, 1.5, 2.0, 3.5 and 6.0 sq Cm. And one Tommy pin is supplied.
  • Complete as above in a wooden carrying case.



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