The invention relates to a system for detecting the degree of compaction or resistance to penetration of soil during the operation of the system, which system comprises means 6 for reciprocating a weight 8 with respect to an impact member 9 to be driven onto or into the soil, and a sensor means 11 adapted to detect the relative movement of that impact member 9 with respect to another member whose vertical position relative to the surface of the ground into or onto which the impact member 9 is driven remains substantially constant or varies in a known manner; and display means responsive to said sensor means 11 for indicating the extent of compaction of the ground. The invention is of especial application in the compaction of soil, notably those with an elastic character. IMAGE
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