1. Look for a refractometer with a wide range of Brix measurements. The higher the range, the more accurate the readings will be.

2. Check the accuracy of the refractometer. The more accurate the readings, the better the quality of the refractometer.

3. Look for a refractometer with a digital display. This will make it easier to read the results.

4. Consider the size of the refractometer. If you plan to use it in the field, you may want to choose a smaller, more portable model.

5. Look for a refractometer with a calibration feature. This will ensure that the readings are accurate.

6. Consider the price. Higher quality refractometers tend to be more expensive, but they will provide more accurate readings.