Nephelometer n. : An instrument for measuring or registering the amount of cloudiness.

Example:
How do I construct a Nephelometer?

Taxonomy
Nephelometer, turbidity, Formazin, FTU, particles, Nephelometric Turbidity Units, special case, turbidity measurements, free encyclopedia, turbidimeter, FNU, detector, instrument, light reflected, standard unit, NTU, Gas-phase, water treatment.

Defination from the web:
nephelometer installation at Acadia National Park. ... adaptor goggles · Disdrometer · Field mill · Hygrometer · Ice Accretion Indicator · LIDAR · Lightning detector · Nephelometer · Nephoscope · Pan ...