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 in to a thread of 3mm dia. Specification : The complete set consists of one each : Glass plate 20cm x 15cm having round ends Brass or stainless steel rod 3mm dia x 150mm long Flexible spatula 15 cm Set of 6 moisture containers Porcelain basin 150mm dia Plastic wash bottle 500ml