| model | U-T6 | U-T6A |
| Optical system | Self-aligning, 1200 line / mm holographic grating | |
| Spectral bandwidth | 4nm | 2nm |
| Wavelength range | 190—1100nm | |
| Wavelength accuracy | ±0.5nm | |
| Wavelength repeatability | 0.2nm | |
| Wavelength display | 0.1nm | |
| Photometric accuracy | ±0.3%T | |
| Photometric repeatability | ±0.1%T | |
| Photometric range | 0-200℅T,-4-4A,0-9999C(0-9999F) | |
| Stability | ± 0.0015A / h (500nm, after warm-up) | |
| Baseline linearity | ± 0.0015Abs | |
| Data Display | 5.7 inch graphic LCD monitor | |
| Stray light | ≤0.05% T, at 220nm and 360nm | |
| Operating system language | Automatic switching between English and Chinese | |
| Data output | USB interface | |