001-MI-(1 Set includes Size constancy apparatus with standard white triangle on a black background with a set of stands and administrator manual)
Size Constancy Apparatus (Performance)
A wooden board consists of a big triangle of 15 cms. in height, on a black background and a standard white triangle on black background measuring 8 cms. The size of the bigger triangle can be varied form 0 – 15 cms both in ascending and descending way by operating the provided lever. A metric scale is provided behind to measure the actual estimation made by the subject.