Source : Webster's Revised Unabridged Dictionary (1913)

Algometer \Al*gom"e*ter\, n. [Gr. ? pain + -meter.] (Psychol.)
   An instrument for measuring sensations of pain due to
   pressure. It has a piston rod with a blunted tip which is
   pressed against the skin. -- {Al*gom"e*try}, n. --
   {Al`go*met"ric}, {*met"ric*al}, a. -- {Al`go*met"ric*al*ly},
   adv.

Source : WordNet®

algometer
     n : device for measuring pain caused by pressure