The refractometer constructed by C. Pulfrich (of the firm of Zeiss, in Jena) has been successfully used by G.
refractometer reading (assuming Paul E. Lehmann.. .
The education for this examination has kept pace with the rapid advances of science, all the following subjects now receiving attention: the microscopical structure of plants and drugs, so as to detect adulterations and impurities in powdered drugs; organic and quantitative analysis, including those of food and drugs, water, soils, gas and urine; optics, so as to enable them to carry out the prescriptions of oculists; spectrum analysis; the use of the polariscope and refractometer; the method of applying RÃ¶ntgen rays; the preparation of glandular secretions and antitoxins; and the chemistry of remedies for the fungoid diseases and insect pests of plants.
Can I rely on a refractometer reading (assuming Paul E. Lehmann...
The best way to know when grapes are fully-grown is to use a device called a refractometer.