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Scientist testing red liquid drops in a refractometer under precise lab conditions.
Cannonau grapes. The agronomist farmer in the vineyard collects the grapes to measure the sugar content with the refractometer. Traditional agriculture in Sardinia. Footage, slow motion.
Optician doctor working with the refractometer machine. Eye exam for young woman at optical store.
Small winery worker measuring grape ripeness with refractometer in vineyard. Manual grape quality control process
A modern device used in ophthalmology is an automatic refractometer. A device for quickly and accurately determining the refractive power of the eye, used in ophthalmology to detect myopia, hyperopia

Free stock videosrefractometer (2)