How to use the sugar meter and what it does
The use method and operation steps of the sugar meter 1. Purpose and principle The use of a hand-held refractometer to measure the total soluble solid (Total Soluble Solid, TSS) content in fruits and vegetables can roughly indicate the sugar content of fruits and vegetables. The phenomenon of refraction occurs when light enters another medium from one medium, and the ratio of the sine of the incident angle is constant, and this ratio is called the refractive index. The content of soluble solids in fruit and vegetable juice is directly proportional to the refractive index under certain conditions (same temperature and pressure), so the concentration of fruit and vegetable juice (the amount of sugar content) can be obtained by measuring the refractive index of fruit and vegetable juice. The commonly used instrument is a hand-held refractometer, also known as a sugar mirror or a hand-held sugar meter. The structure of the instrument is shown in the figure below. By measuring the soluble solid content (sugar content) of fruits and vegetables, the quality of fruits and vegetables can be understood, and the maturity of fruits can be roughly estimated. 2. Drugs and equipment Tomato, citrus, pineapple, distilled water, beaker, dropper, roll paper, hand-held refractometer 3. Operation steps Open the cover (a) of the hand-held refractometer and wipe it carefully with clean gauze or roll paper Dry prism glass surface. Put 2 drops of distilled water on the prism glass surface and cover with a cover slip. In the horizontal state, observe from the eye-connecting part (b), and check whether the boundary line between light and dark in the field of vision is on the zero line of the scale. If it does not coincide with the zero line, turn the scale adjustment screw so that the dividing line just falls on the zero line. Open the cover, dry the water with gauze or roll paper, then drop 2 drops of fruit and vegetable juice on the prism glass surface as above, observe, read the scale on the boundary line between light and dark in the field of vision, that is, the soluble solids in the fruit and vegetable juice Content (%) (approximate content of sugar). repeat three times.
