This product uses fluorescent UV lamps that best simulate the UV spectrum of sunlight, and combines temperature control and humidity supply devices to simulate the high temperature, high humidity, condensation and dark rain cycles of sunlight (UV section) that cause damage to materials such as discolouration, loss of brightness, strength, cracking, peeling, chalking and oxidation. At the same time, through the synergistic effect between UV light and moisture makes the single light resistance or single moisture resistance of the material weaken or fail, so widely used in the evaluation of the weather resistance of materials, the equipment has the best sunlight UV simulation, the use of low maintenance costs, easy to use, the equipment uses the control of automatic operation, high degree of automation of the test cycle, good stability of light, test results reproducibility and other characteristics.