The 5231 from Ophir RF is a RF Amplifier with Frequency 0.01 to 50 MHz, Gain 51 dB, Gain Flatness ± 1.5 dB max, Output Power 50.79 to 51.76 dBm, Output Power 119.95 to 149.97 W. Tags: Benchtop / Rackmount, Power Amplifier. More details for 5231 can be seen below.