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Sulfur dioxide test box overall molded by high temperature welding, corrosion resistance, easy to clean, no leakage phenomenon. Between the box cover and the box body, the water seal structure is adopted, no gas overflow. The test condition of the test items in the box can be clearly seen through the transparent material. Equipped with dual gas filter device, the air will not pollute the environment. Control circuit board and other components are fixed in easy for inspection and maintenance of the position, the lock opening type side door, not only beautiful and easy to maintain.