The ultraviolet-visible spectrophotometer is a spectroscopic analytical instrument that utilizes the selective absorption characteristics of substances in the ultraviolet-visible light band to perform qualitative and quantitative analysis of substances. It is one of the most widely used basic pieces of equipment in modern analytical laboratories.

The core performance indicators of a UV-Vis spectrophotometer mainly include wavelength range, wavelength accuracy and repeatability, spectral bandwidth, stray light, and transmittance accuracy and repeatability. Wavelength range determines the types of substances the instrument can detect, and covering a wavelength range of 190nm-1100nm is sufficient for most routine detection needs. Wavelength accuracy directly affects the accuracy of the detection results, while stray light levels significantly impact the detection accuracy of low-concentration samples.

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