Introduction to the usage method and operating steps of the sugar meter
Usage and operating steps of sugar meter
1、 Purpose and principle
The use of a handheld refractometer to determine the total soluble solid (TSS) content in fruits and vegetables can roughly represent the sugar content of fruits and vegetables. When light enters one medium from another, it undergoes refraction, and the ratio of the incident angle sine is constant, which is called the refractive index. The content of soluble solids in fruit and vegetable juices is directly proportional to the refractive index under certain conditions (at the same temperature and pressure). Therefore, measuring the refractive index of fruit and vegetable juices can determine the concentration (sugar content) of the juice. The commonly used instruments are handheld refractometers, also known as sugar mirrors or handheld sugar meters. The structure of this instrument is shown in the following figure. 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 the fruit can be estimated approximately.
2、 Medicines and equipment: Tomatoes, oranges, pineapples, distilled water, beakers, droppers, rolls of paper, and handheld refractometers. 3. Operating steps: Open the cover plate of the handheld refractometer (a), and carefully dry the prism glass surface with clean gauze or rolls of paper. Drop 2 drops of distilled water on the prism glass surface and cover it with a cover. In a horizontal state, observe from the eye (b) and check whether the boundary between light and dark in the field of view is at the zero line of the scale. If it does not coincide with the zero line, rotate the scale adjustment screw so that the boundary plane falls exactly on the zero line. Open the cover, dry the water with gauze or roll paper, and then drop 2 drops of fruit and vegetable juice on the prism glass surface as described above. Observe and read the scale on the light dark intersection line in the field of view, which is the soluble solid content (%) (approximate sugar content) in the fruit and vegetable juice. Repeat three times.
