Model 3500 is a portable RF power meter designed for field and laboratory measurements. The instrument, which operates from 10 MHz to 6 GHz, offers a simple user interface with clear liquid-crystal-display (LCD) screen. The power sensor and display electronics are contained in the same compact housing, which also includes a Universal Serial Bus (USB) interface for connection to an external personal computer. The meter can operate from and AC-DC converter module, an on-board battery, or from the USB interface. For more information on the compact power meter, visit the Keithley web site at: