- Bacteriology. an apparatus containing a series of barium chloride standards used to determine the number of bacteria in a suspension.
- Physical Chemistry. an instrument for studying the density of suspended particles in a liquid by measuring the degree to which the suspension scatters light.
- chem an instrument for measuring the size or density of particles suspended in a fluid
- An apparatus used to measure the size and concentration of particles in a liquid by determining the amount of light scattered by the liquid.