the United StatesCIFThe series of instruments produced by the company, including constant temperature electric heating plates, digestion instruments, acid purification, acid cleaning, etc., are the world's first to adopt a separate design concept of heating modules and control modules, which not only greatly reduces the corrosion pollution of control systems caused by acid vapor, etc,Ensuring the safety of operators, the heating system adopts a plug-in design and a surrounding three-dimensional heating method, greatly ensuring the uniformity and stability of heating. The sample processing is fast, and the maintenance is simple and convenient, greatly extending the service life of the instrument, which is the longest among other similar products2-3Twice.