Ẹya ti o jẹ ohun elo ti o jẹ iyasọtọ ti o wulo kọnputa ti a ṣe apẹrẹ fun gbigbe si ẹrọ ṣiṣu, iwe kekere, gilasi abẹ, gilasi pẹlẹbẹ. O tun le waye ninu awọn ayẹwo omi (omi, mimu, idoti awọ, iwọn awọ ati ile-iṣẹ ati iṣelọpọ ogbin ni aaye ohun elo gbooro ni aaye ohun elo gbooro.
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