The LPT-3000RX4 from LP Technologies is a RF Spectrum Analyzer with Frequency 9 KHz to 3 GHz, Frequency Resolution 1 Hz, Resolution Bandwidth 1 Hz to 1 MHz, DANL -117 to -85 dBm, Attenuation Range 50 dB. Tags: USB / Computer Controlled. More details for LPT-3000RX4 can be seen below.