Double Valves: The valve core is precisely processed by metal materials, and the air flow rate is gradually regulated from small to large. this vacuum drying dish ensures efficient drying of your samples High Quality: High-quality polycarbonate injection molding, high-quality silicone rubber O-ring seals between the upper and lower parts of the vessel, better sealing performance Long Storage Time: 30 days after vacuuming, the degree of vacuum changes less than 6%. Dry storage under vacuum can greatly extend the storage time Transparent: The transparent vacuum desiccator jar allows for easy to monitor of the drying process, making it a practical tool for any laboratory setting Wide Application: Our lab vacuum dryer is suitable for vacuum drying and storage of biochemical reagents, medicines, optical lenses, precision components, seeds, cultural relics and other items