Refractometers are versatile in their design and use, and are able to provide results as refractive indices, or in other cases, as direct measurements of parameters such as soluble solids, sugar ...

Refractometer is precision optical instrument that operates on the principle- as the concentration or density of a solution increases, its refractive index changes proportionately. The refractive ...

THE accompanying diagram shows the essential parts of a refractometer using the principle of phase contrast, which is new for this class of instrument. It gives relative measurements, like most of the ...

To compare focometer and autorefractor in the measurement of refractive errors among students in an underserved community of sub-Saharan Africa. A total of 230 students were studied. Mean age of the ...