How to use and operate the sugar meter
How to use and operate the sugar meter 1.
Purpose and principle
The total soluble solids (Total Soluble Solid, TSS) content in fruits and vegetables can be measured by a hand-held refractometer, which can roughly represent 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 (sugar content) of fruit and vegetable juice 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 of the hand-held refractometer
(a), Carefully dry the glass surface of the prism with a clean gauze or roll-up paper. Put 2 drops of distilled water on the prism glass surface and cover with a cover slip. in a horizontal state, from the eye
Observe at (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 glass surface of the prism as above for observation, and read the scale on the boundary line between light and dark in the field of vision, which is the soluble solids in the fruit and vegetable juice Content (%) (approximate content of sugar). repeat three times.
