Ladybug Technologies has manufactured a broad line of NIST traceable USB power sensors.
The sensors are compatible with Windows XP, Win 7, Win 8; in 32 and 64 bit systems. LINUX-compatible sensors along with the only SPI & I2C sensor are also available. With their patented NoZero NoCal feature, it is not necessary to zero or calibrate before making measurements, even for low level measurements requiring high accuracy.
Ladybug said the sensors are housed in a robust metal enclosure for durability and offer a variety of connectors including N, SMA, 3.5mm and 2.92mm. They include limit free, flexible applications for use with our products at no additional cost.
They cover the RF and microwave market with three sensor types.