ASTM D 1558 D 2573
This is fork determining the bearing capacity of sub grades or for compaction control. It also used for rapidly of soils in shallow exploration work.
Consists of a study handle under. Which is fixed a sensitive proving ring. An extension piece is fixed to the bottom of the proving ring and carries a detachable penetration cone at its tip. Proving ring capacity 100 kg (1kn) and 0.002mm dial gauge provided indicates the penetration load applied.