The gradient-oven is a device for evaluating the baking and curing behavior of liquid paints, powder coatings, and resins. The gradient-oven is also used for accelerated acid-etch testing for automotive coatings. A micro-processor controls 45 heating elements that are individually controlled and monitored. A coated panel can be tested by a step gradient or linear gradient programs set-up by the user. The temperatures are precisely measured by a PT-100 probe inserted into each element.