• PA 203 (BNC/SMA)-100kHz to 3GHz, 20dB gain, best for LF and RF probes. • PA 303 (N/BNC/SMA)-100kHz to 3GHz, 30dB gain, best for LF and RF probes. • PA 306-100kHz to 6GHz, 30dB gain, best for XF probes. • PA 3010 (SMA)-10MHz to 10GHz, 30dB gain, best for SX probes. • PA 2522 (SMA)-10MHz to 22GHz, 25dB gain, best for SX and HR probes.