Weatherometer is a device that measures the controlled weathering of a sample of material under the influence of light, oxidation, moisture, etc..

Weatherometer is a laboratory device that uses high-powered light sources & water to simulate long-term outside exposure. Ultraviolet (UV) light, a wavelength of light from the sun not visible to the human eye, can cause long-term damage to paints, plastics, fabrics and concrete finishes. Water, including rainwater and ocean saltwater, can attack finishes and degrade them. The Weatherometer can create ultraviolet, indoor, or other light frequencies to test products under controlled conditions and include water spray to add further environmental effects.

A high-intensity bulb provides light, with several types available to simulate different light sources. Carbon-arc bulbs can simulate sunlight and xenon can be used for indoor and outdoor light frequencies. Metal halide bulbs have been replacing carbon arc Weatherometers since the late 20th century because carbon arc bulbs require regular maintenance to replace the carbon electrodes in the bulb that wear out frequently.

Another effect of extended light exposure is a loss of color in a material, known as colorfastness. Colored pigments contain organic molecules that can be attacked by sunlight or artificial light from a Weatherometer. Researchers can test the stability of various colors and additives used to protect them, under controlled laboratory conditions. Maintaining color stability is important because a paint or coating is used to protect metal, wood or concrete beneath; damage to the color can result in eventual damage to the underlying material.

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