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The DC-401 series drying ovens have an outer shell made of high-quality steel plates welded together, with a surface coating. The inner chamber is made of steel plates coated with high-temperature resistant silver powder paint or stainless steel plates, equipped with two to four layers of shelves. The insulation is provided by ultra-fine glass wool, and the oven door features a double-layered glass observation window. The working chamber and the door are sealed with heat-resistant silicone rubber or asbestos rope for thermal insulation. The power switch, temperature controller, and other control components are centrally located at the front of the oven for easy operation. The heating and temperature maintenance system inside the oven consists of electric heaters and a temperature controller. When the power is turned on, the heat generated by the electric heaters circulates naturally within the working chamber to dry the items, ensuring uniform temperature distribution. The temperature controller is a microcomputer intelligent digital temperature controller that employs a progressive heating method to minimize temperature overshoot, featuring self-tuning capabilities for high precision temperature control. The set temperature is equipped with a protection device and has a tracking alarm function to ensure safety and reliability.