A portable teaching/research and development level experimental device that can visually display the chemical physical changes caused by ultraviolet radiation within 30 seconds, suitable for classrooms, exhibitions, and laboratories. Quickly verify mechanisms such as UV curing, photocatalysis, fluorescence conversion, or material aging. Replace the traditional "dark box+long-term illumination" solution and achieve "one click demonstration, instant visibility". TiO ₂ coated glass undergoes a sudden change in hydrophilicity upon exposure to UV, causing water droplets to spread out instantly. Applicable scenarios: Science classes in primary and secondary schools, materials/chemistry experiments in universities; Interactive exhibition booths for paint, adhesive, and 3D printing companies; The quality inspection department quickly evaluates the UV curing process window.