Moisture contents at which soil has smallest plasticity is called limit. For determination purpose plastic limit is defined as the water content at which a soil will just begin to crumble when rolled into a thread of 3mm. dia.
Specifications :The complete set consists of one each:- 1.Glass plate 20 cm x 15 cm having ground ends and one side frosted. 2.Brass or stainless steel rod 3 mm dia x 150 mm long. 3.Flexible spatula. 4.Set of 6 moisture containers. 5.Porcelaine basin 150 mm dia. 6.Plastic wash bottle 500ml.