Microprocessor-controlled single-beam UV-Vis spectrophotometers (range ~190–1100 nm) offer precise, automated photometric analysis for laboratories, featuring 128x64 LCD screens, 4-position cell changers (10–100 mm), and USB/RS232 PC connectivity. These instruments provide high stability, 2 nm bandwidth, and automatic wavelength calibration for absorbance/transmittance/concentration measurements. 

Key Features and Specifications 

• Optical System: Single beam with a diffraction grating (1200 lines/mm) ensures accurate spectra, often using deuterium (

  D2cap D sub 2

  ????2) lamps for UV and tungsten (W) lamps for visible light.
• Wavelength Range: Typically 190 nm to 1100 nm, or 195–1020 nm, depending on the model.
• Spectral Bandwidth: Commonly 2 nm or 5 nm.
• Photometric Range: Often 0–200% T, -0.3–3 A, 0–1999 Conc.
• Display & Interface: 128x64 or 16x2 line alphanumeric, backlit LCD display with soft-touch keys.
• Data Handling: Stores up to 100 samples (0–99).
• Sample Compartment: 4-position cell changer (10 mm path length) included, with options for up to 100 mm holders.
• Connectivity: USB port or RS-232C for printer and PC software, supporting kinetic/quantitative analysis.