Phil,
They only went out of production late 2007 or early 2008. There is one
fellow who was still selling them recently. Tom KB8TYJ from this list got
one only a month or so back, perhaps he can chime in with info.
Besides talking swr and both forward and reflected power it has tones for
power and swr tuning. A real nice box if you can locate one.
73, Steve KW3A