Another limitation of Penetration Resistance is the relatively great spatial variation associated with a point measurement, rather than a bulk soil measurement. Reference stated that to strengthen the value of point measurements of Penetration Resistance further studies to develop relations between Penetration Resistance and non-point measurements of shear strength are needed. Reference highlighted the inter relatedness of bulk density and Penetration Resistance in assessing soil strength and further stated that using only one of these variables may lead to misleading results. Although these two parameters may provide adequate information for evaluating soil compaction and strength, newer technologies such as the clegg impact tester may prove useful across a wider moisture content range.