As Per IS 1199, IS 7320
Specification :
The slump cone in these slump test apparatus is filled
with freshly mixed concrete and tamped with a tamping rod in three
or four layers. The top of the concrete is leveled off with the top of
the slump cone, the cone is lifted vertically up and the slump of the
sample is immediately measured. The complete slump test
apparatus set comprises of a Steel Octagon Base Plate (8 faces) with
carrying handle, Graduated Tamping Rod 16mm dia. x 600mm long
with one bullet end, slump cone having base 200mm, height
300mm fitted with handle.