The CR9000XC, a compact version of the CR9000X, holds up to five user-selectable I/O modules. It is a modular, multiprocessor system that provides precision measurement capabilities in a rugged, battery-operated package. It consists of an environmental enclosure, a base system, and a chassis containing slots for the I/O modules. The CR9000X series is our fastest data logger series, with a measurement rate of 100,000 Hz and a clock speed of 180 MHz, making it ideal for rapid sampling applications. For the entire list of available I/O modules for the CR9000XC and CR9000X, visit the Other Accessories section of the Ordering Info page for the CR9000XC and the CR9000X.  Campbell Scientific also offers the CR9000X, a larger version, that accepts up to nine I/O modules. For more information, visit the CR9000X Product Info page.