A single-crystal diffractometer that features instantaneous and automated x-ray wavelength change has been released by Bruker AXS, a subsidiary of Bruker BioSciences Corp. The Apex Duo combines a molybdenum sealed tube and a high-intensity, air-cooled copper microfocus tube with a CCD detector. The combination allows operation of both x-ray sources without any changeover. Typically, one source is in operation while the other is on standby. The device comes with a suite of crystallographic programs.