an instrument that consists of a calibrated, vertical rod to which are attached two horizontal arms, one fixed and one movable, for measuring the human trunk and limbs.
Main Entry: an·thro·pom·e·ter Pronunciation: "an(t)-thr&-'päm-&t-&r Function: noun : an instrument used formaking anthropometric measurements and consisting of four hollow graduated tubes that fit into one another to form a rigid rod
[an-thruh-pom-i-ter] 
θrəˈpɒm