An "annealer" is a device used in the process of annealing, which involves heating materials, typically metals or glass, to a specific temperature and then cooling them slowly. This process helps to relieve internal stresses, improve ductility, and enhance the material's overall properties. In the context of manufacturing, annealers are commonly used in industries such as metallurgy and glass production. By controlling the temperature and cooling rates, annealers ensure that the final product meets the desired specifications and performance standards.