巴基斯坦采购需求：低温容器，液氮冷冻机，不锈钢液氮容器，不锈钢液氮罐，液氮钢瓶，液氮杜瓦瓶

I'm looking for a liquid nitrogen gas container specifically designed for veterinary use, with a capacity of 2 liters. The primary purpose of this container is to safely store semen, so it needs to ensure optimal preservation and minimal temperature fluctuation. Additionally, please provide information on any available features, such as portability, safety mechanisms, and ease of use. I'd appreciate details about pricing, lead times, and any bulk order discounts if applicable. Looking forward to your prompt response.