The HP 435B Agilent is an analog power meter, compatible with the entire series of 8480 Power Sensors (sold separately).
▪ -65 dBm to +44 dBm power range, full scale (depending on sensor)
▪ 100 kHz to 110 GHz frequency range
▪ <1% uncertainty
▪ Low noise and drift
▪ Auto-zero