The A6 from Transcom Instruments is a RF Spectrum Analyzer with Frequency 10 MHz to 6 GHz, Resolution Bandwidth 10 Hz to 5 MHz, DANL -169 to -131 dBm, Attenuation Range 0 to 30 dB, Amplitude 20 dBm. Tags: USB / Computer Controlled. More details for A6 can be seen below.