Main features: 1. Strong instrument performance: extremely excellent optical system, advanced electronic system and high-level mechanical system ensure ultra-low stray light of 0.010% T; 2. Stable and reliable quality: The dual-beam dynamic feedback proportional recording photometry system ensures the baseline stability; Deuterium lamp, photomultiplier tube and other key devices are imported parts to ensure the stability, reliability and long life of the instrument; 3. Accurate measurement: Adopt imported high-quality holographic grating to further reduce the stray light of the instrument and make the instrument analysis more accurate; 4. Easy and efficient man-machine dialogue: UVWin Chinese operation software based on WINDOWS environment provides rich instrument control and operation functions. Simple and easy to use, flexible and efficient, and easily meet the analysis requirements of users; 5. Excellent expandability: There are a large number of user-selectable special accessories such as peristaltic sampler, ultra-micro pool holder, constant temperature pool holder, optical integrating sphere, specular reflection, optical fiber accessories and cuvette series, which greatly expand the application range of the instrument; 6. Simple and convenient equipment maintenance: The unique socket tungsten lamp and deuterium lamp avoid optical debugging when changing lamps, which makes the debugging and maintenance of equipment and instruments easier.