| 1 | Wavelength coverage | Many UV-Vis instruments cover portions of the ultraviolet and visible regions; a common benchtop range is approximately 190–1100 nm. | Confirm the usable range and performance specifications for the exact model and application. |
| 2 | Optical arrangement | Single-beam and double-beam designs are both used. Double-beam systems compare sample and reference signals during measurement. | Compare measurement workflow, baseline stability, throughput, and maintenance needs. |
| 3 | Light sources | Deuterium lamps are commonly used for ultraviolet wavelengths, while tungsten-halogen lamps are commonly used for visible and near-infrared wavelengths. | Check lamp replacement procedures, expected service life, and whether the instrument switches sources automatically. |
| 4 | Wavelength selection | Scanning instruments commonly use a monochromator; array-based instruments can record multiple wavelengths across a detector array. | Choose based on scan speed, spectral range, and the measurement methods required. |
| 5 | Spectral bandwidth | Spectral bandwidth describes the wavelength interval passed by the optical system. Available settings vary by instrument design and model. | Match the specified bandwidth to the resolution needs of the method; narrower bandwidth is not automatically better for every test. |
| 6 | Sample cells | Quartz cells are commonly used for UV measurements. Glass and many plastic cells are generally suited to visible-range work, subject to their transmission properties. | Verify cell material, path length, and compatibility with the sample and measurement wavelength. |
| 7 | Detector technology | Photodiode and photomultiplier-based detectors are used in UV-Vis instruments; detector choice affects sensitivity, dynamic range, and instrument design. | Review model-specific signal-to-noise and photometric specifications under relevant conditions. |
| 8 | Measurement modes | Common functions include absorbance, transmittance, wavelength scanning, and concentration measurements using a calibration or analytical method. | Confirm that the software supports the required methods, data export, and reporting workflow. |
| 9 | Sample throughput | Manual cell holders, multi-cell changers, and microplate accessories are available across different instrument configurations. | Assess sample volume, batch size, temperature control, and accessory compatibility. |
| 10 | Quality and support | Calibration, performance verification, documentation, user training, and access to service are important considerations for laboratory instruments. | Request model-specific specifications, service terms, calibration documentation, and details of local technical support. |