Used for determining the relationship between the moisture content and density of compacted soil. The rammer construction includes a guide sleeve with vent holes.

Different versions are available that conform to the various commonly used standards. They are all made of plated steel and are identical in shape, only differing slightly in diameter and capacity. An alternative (and preferable) method of compacting is to use an automatic compactor. The mould includes collar, mould body and base plate. Steel plates may be used at the end of compaction on top of last layer (optional).