Keysight Agilent HP 1159A Features: AutoProbe interface compatible Low noise and low input capatitance External attenuators and AC coupler Superior tolerance to ESD Small size and rugged attenuation The Agilent HP 1159A is a FET input differential probe with 1 GHz bandwidth and greater than 19 dB CMRR (Common Mode Rejection Ratio) at 500 MHz. The Agilent HP 1159A offers the 1:1 attenuation, making it ideal for characterizing high bandwidth, low-voltage signals.