osmoscope

noun2

1. •
   An instrument for detecting and for measuring odors.

   • Odorless air enters osmoscope through side tube where it is mixed with odorous test air which enters from end tube. — 1949
2. •
   An instrument for measuring osmosis.

   • The osmoscopes developed in the authors' laboratory are comparable in their basic concept with the grease-spot photometer employed by Bunsen to measure the intensity of a light source. — 1935