The Collaborative International Dictionary of English v.0.48:
Craniometer \Cra`ni*om"e*ter\ (kr?`n?-?m"?-t?r), n. [Cranium + -meter.] An instrument for measuring the size of skulls. [1913 Webster] CraniometricWordNet (r) 3.0 (2006):
craniometer n 1: an instrument for measuring skull sizes