The LBSF09A 1MHz to 9GHz power sensor from LadyBug is the world's smallest power sensor with traceable calibration.  The RMS responding diode-based sensor accurately measures signals regardless of modulation bandwidth. The sensor was designed for embedding and integration into automated systems and uses standard SCPI measurement commands. The standard interface is USB, Optional interfaces include SPI, I2C and HiSLIP LAN.