Moisture contents at which soil has smallest plasticity is called limit. For determination purpose plastic limit is denied 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 :

I) Glass plate 20cm x 15cm having round ends,

ii) Brass or stainless steel rod 3mm dia x 150mm long,

iii) Flexible spatula 15 cm