The minimum requirements are:
- Spectral slit width maximum 2nm
- WavelengthRequired range: The full uv / visible range is normal but at least 400 to 700 nm
- Accuracy ± 1 nm
- Precision ± 0.5 nm
- Photometric
- Absorbance range 3A
- Accuracy ± 2% max ± 1% over as much of the range as possible