1) Measuring instrument 
A nephelometer is an instrument for measuring concentration of suspended particulates in a liquid or gas colloid. A nephelometer measures suspended particulates by employing a light beam (source beam) and a light detector set to one side (often 90°) of the source beam. Particle density is then a function of the light reflected into the detector f...
instrument for measuring cloudiness
• (n.) An instrument for measuring or registering the amount of cloudiness. • (n.) An instrument for measuring or registering the amount of cloudiness.
(from the article `Richards, Theodore William`) Richards greatly improved the technique of gravimetric atomic weight determinations, introducing quartz apparatus, the bottling device, and the ...
An instrument used in nephelometry. ... Origin: G. Nephele, cloud, + metron, measure ... (05 Mar 2000) ... 
(nef″ә-lom´ә-tәr) an instrument for measuring the concentration of substances in suspension by the amount of light that is scattered by the suspended particles.
Neph`e·lom'e·ter noun [ Greek ... a cloud + -meter .] An instrument for measuring or registering the amount of cloudiness. 
an instrument that measures scattered light in a liquid.
Type: Term Pronunciation: nef′ĕ-lom′ĕ-tĕr Definitions: 1. An instrument used in nephelometry.
nephelometer 1. An instrument to register the comparative cloudiness of the sky. 2. A photometer designed to estimate the amount of particulate matter in a turbid medium, measuring light-scattering properties to make comparisons with a series of standard suspensions. 3. In optics, any of various instruments that measure the intensity of light scat...
an apparatus containing a series of barium chloride standards used to determine the number of bacteria in a suspension. · an instrument for studying the density of suspended particles in a liquid by measuring the degree to which the suspension scatters light.