The S3331B from Saluki Technology is a RF Spectrum Analyzer with Frequency 9 kHz to 7.5 GHz, Frequency Resolution 1 Hz, Resolution Bandwidth 1 Hz to 3 MHz, Video Bandwidth 10 Hz to 3 MHz, DANL <-148 to -125 dBm. Tags: USB / Computer Controlled, Analyzer with Screen. More details for S3331B can be seen below.