kinemometer

noun2

1. •
   A highly sensitive type of tachometer.
2. •
   An electromagnetic device, similar to the velocity ballistocardiograph, for measuring contraction and relaxation in a tendon reflex.

   • He suggested that the Lawson kinemometer, a quantitative device for testing the Achilles' tendon jerks, might be a useful method for surveying families for hypothyroidism. — 1961