The device comprises of a blow counter, a removable brass cup fitted on the base and an adjustable crank and cam mechanism. The UTEST Manual Liquid Limit Apparatus (Casagrande) is an apparatus used to measure the moisture content at which clay soils pass from plastic to liquid state. The relationship between the three is that the shrinkage limit defines when dry soil becomes friable, the plastic limit is where the soil becomes malleable and the liquid limit where the soil becomes liquid and able to flow.
The Shrinkage limit, Plastic Limit and Liquid limit together form the Atterberg limits, important for the effect of water on clay or silt soils.
