Yonglida 2WAJ monocular Abbe refractometer is an instrument that can measure the refractive index ND and average dispersion NF-NC of transparent, translucent liquids or solids. The instrument is connected to a thermostat and can measure the refractive index ND at temperatures between 0c and 70c. And can measure the percentage of sugar concentration in sugar solution.

| 2W (binocular) | 2WAJ (monocular) | WAJ-2S (digital display) | |
| Refractive index ND measuring range | 1.300~1.700 | 1.300~1.700 | 1.300~1.700 |
| Refractive Index ND Measurement Accuracy | 0.0003 | 0.0002 | 0.0002 |
| Refractive index ND minimum graduation value | 0.001 | 0.0005 | 0.0002 |
| Sugar concentration (%) measuring range | 0~95 | 0~95 | 0~95 |
| Sugar concentration (%) minimum graduation value | 0.5 | 0.25 | 0. |