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Measurement of refractive index nD of transparent or translucent liquid and solid substances.
Measurement of the Brix of sugar solution.
Automatic correction of the effect of temperature on the Brix.
Prism made of hard glass.
It works with 589nm wavelength and uses LED as light source.
| Model | RF-AD3P | RF-AD2 |
|---|---|---|
| Measurement Range | Refractive index nD: 1.30000-1.72000 | Refractive index nD: 1.3000-1.7000 |
| Brix: 0-100% | Brix: 0-100% | |
| Measuring Accuracy | Refractive index nD: ±0.0002 | |
| Brix: ±0.1% | ||
| Measuring Resolution | Refractive index nD: 0.00001 | Refractive index nD: 0.0001 |
| Brix: 0.01% | Brix: 0.1% | |
| Temperature Range | -20-120℃ | 0-50℃ |
| (Min. 0.1℃) | ||
| Display | Color touch screen | LCD |
| Interface | RS232 / USB | RS232 |
| Date Storage | 500 sets | —— |
| Gross Weight | 12kg | 12 kg |
| Shipping Size (WxDxH)(mm) | 370×240×470 | 370×240×470 |



A beam of light is directed at a sample, and the angle at which the light bends or refracts as it passes through the sample is measured. This angle is then compared to a known scale or reference chart to determine the substance’s refractive index.
Refractometers can be used to measure a variety of substances, such as liquids, gases, and solids. They are particularly well-suited for measuring the concentration of dissolved solids in liquid samples, such as the sugar content in fruit juice or wine.
Light Source: The refractometer directs light through a prism made of high-refractive-index glass.
Sample Placement: Place a few drops of the sample liquid on top of the prism.
Refraction Measurement: As the light passes through the sample and the prism, it is refracted based on the sample’s refractive index.
Observation: The user observes the light through a telescope attached to the refractometer. They will see a boundary line between light and dark areas, which corresponds to the refractive index.
Calibration and Reading: The refractive index is read from a scale inside the instrument, typically with an accuracy of four decimal places.