I suggest you only check Agilent's strengths and weaknesses. Many old brands and 2 1 1 engineering projects are owned by Agilent. The biggest advantage of Agilent is its humanized design and reasonable price. It is generally not easy to have problems, and even if problems occur, it is easy to solve them by yourself. Unlike other brands, if something goes wrong, you have to find an after-sales service. I believe you will be responsible for solving the problem of instruments in the future. Don't consider Hitachi's, it's not good in all aspects and has a bad reputation. All the equipment purchased by our school are Agilent, including gas phase and liquid phase. Shimadzu's is average, but the effect is good, but the design is not as good as Agilent's. After using it, you will feel it, especially the workstation is not easy to use.