Watlow is the largest custom designer and manufacturer of industrial electric heaters, sensors, controllers and software with offices and manufacturing facilities around the world.Watlow brings its thermal expertise to n......Watlow is the largest custom designer and manufacturer of industrial electric heaters, sensors, controllers and software with offices and manufacturing facilities around the world.Watlow brings its thermal expertise to numerous applications, including semiconductor, analytical instrumentation, medical equipment, plastics processing, foodservice equipment, packaging, aerospace and others.