The CF-6004 from National Instruments is a 14-bit multifunction data acquisition device that plugs directly into a PDA CompactFlash slot to provide up to 200 KS/s single-channel sampling on four analog input channels in a handheld form factor. It also offers four lines of digital I/O for controlling and measuring LVTTL or LVCMOS signals. The NI LabVIEW graphical programming environment for Pocket PC can be used to acquire, analyze and view the data on their PDAs. The CF-6004 costs about 595 Euro.