The USB-SA44B from Signal Hounds is a Software Defined Radio (SDR) optimized RF Spectrum Analyzer that operates up to 4.4 GHz. It has a wide dynamic range from -151 to 10 dBm with a resolution bandwidth from 0.1 GHz to 250 KHz and 5 MHz. It is a compact, easy to use spectrum analyser for use in the lab, by ham radio enthusiasts, and electronics hobbyists. The USB-SA44B has a preamplifier for improved sensitivity and reduced LO leakage. It also has a thermometer for temperature corrections, allowing accurate amplitude measurements over the entire operating temperature range.