fadometer

plural fadometers

1. A device that irradiates materials in order to test the degree to which they fade from exposure to sunlight.

   A hundred hours in the fadometer equals half a year in Florida sunshine.

   1940 August 19, “River Rouge”, in LIFE, volume 9, number 8, page 45

   3 more examples

   We also tried the fadometer and found it graded in between. Taking that same example — between 70 and 21 to the ultra-violet light — it was 70 and 45 to the fadometer.

   1930, Technical Association of the Pulp and Paper Industry, Technical Association Papers - Volume 13, page 75

   The use of a fadometer is to be recommended, but because of its limited use in the average leather laboratory the adoption of the ordinary exposure test is considered best.

   1936, The Journal of the American Leather Chemists Association

   Essentially, these consisted of placing fabric swatches under the light of the Florida sun or of a fadometer, and then examining them to determine the degree of fade.

   1957, Milton Jacobs, Fabrics and Fibers for Passenger Cars