During the testing process, the heating effect of the heating wire and the condensation effect of the evaporator generate water, water vapor, and exhaust gas at a certain temperature. Water enters the pressure balance pipe through the drain hole at the bottom of the test chamber. Water vapor (including water vapor discharged from the humidification boiler through the humidification pressure balance port) and gas are discharged into the pressure balance pipe through the chamber pressure balance port. Due to thermal effects, the water vapor and exhaust gas rise. As they pass through the primary cooler below the check valve, the exhaust gas continues to rise and exit the chamber, while the water vapor condenses into water droplets. The water discharged from the bottom of the tank and the wastewater generated by the humidifying boiler enter the secondary cooler for secondary cooling. After passing through the filter and pure water purification filter, it will finally be stored in the recycling water storage tank. When the water level float senses that there is no water in the storage cup, the micro water pump will directly draw water from the recycling water storage tank into the storage cup. When the float in the balance cup senses that the humidifying boiler is short of water, the boiler water supply valve will open. At this time, the water will enter the humidifying boiler, absorb the heat generated by the humidifying pipe, turn into water vapor, and re-enter the tank, forming a circulation system.