委内瑞拉采购需求：溶解氧仪、在线溶解氧仪、便携式溶解氧仪、光学溶解氧仪、溶解氧分析仪

I'm interested in understanding the key differences between two specific models you offer. Could you provide detailed insights on their features, specifications, and any performance variations? This information will help me make a more informed decision. Additionally, I would appreciate it if you could share an approximate price for both models, either on an FOB or ExW basis from China. This will allow me to evaluate the cost implications better and plan accordingly. Looking forward to your prompt response!