Based on years of R&D and production experiences on simultaneous wavelength-dispersive X-ray fluorescence spectrometer, MRC Instrument proudly launched WDX-4000, the first sequential wavelength dispersive X-ray fluorescence spectrometer which integrates unique and remarkable innovations. The performances of WDX-4000 meet the requirements of JJG 810-1993 Verification regulation for Wavelength dispersive X-ray Fluorescence Spectrometers. It can be used in fields of geology, cement, steel and environmental protection, etc. By a large number of general designs, WDX-4000 provides reliable and economical maintenance to customers in time.