This is an Agilent 8447F Amplifier. This unit is in good condition, and guaranteed fully operational.
The Agilent 8447F is a reconditioned Preamplifier and Power Amplifier
that is combined into a single package. The Keysight Agilent HP 8447F is
capable of providing gain and power to overcome systematic RF losses,
drive high-power devices and improve measurement system performance. The
Agilent 8447F can be used to increase low-level sweep speed and
increase dynamic range measurements when used with a network analyzer.
Shipping in the USA is $30.