The QUV weather tester reproduces the damage caused by sunlight, rain and dew. In a few days or weeks, the QUV UV Tester can reproduce damage caused during months or years of outdoor exposure. The QUV tests materials by exposing them to alternating cycles of UV light and moisture at controlled high temperatures. It simulates the effect of sunlight with special UV fluorescent lamps, the effect of dew and rain is simulated with condensing moisture and/or spray water.