IPA: /nɛˈfɛləˌmɛtər/
KK: /nɛfələˌmɛtər/
A device that measures how cloudy a liquid is or how many small particles are in it by analyzing the light that is scattered by the liquid.
The scientist used a nephelometer to analyze the water samples for pollution levels.
Nephelometer → It is formed from "nephelo-" (from Greek "nephele", meaning cloud) and "-meter" (from Greek "metron", meaning measure). The word refers to an instrument that measures the amount of cloudiness or turbidity in a liquid.
Think of 'cloud' ('nephele') and 'measure' ('metron') to remember that a nephelometer is a device that measures cloudiness.