This is a quality Furman American built unit, in near mint excellent condition. This is a great power signal system monitor to have. For those that are not familiar with this unit. It monitors you entire sound or recording system. Right down to the output of your power amp or power source. You can also monitor amplifier clipping, and monitor your main system signal, like a standard VU meter. I really utilized this monitor in my studio, my rack steel guitar amp setup, and our PA system. Was a life saver. It's simple to setup and use. I had three of these. This is the last one I have left. $150 SHIPPED Lower 48 Please
You can browse through the owners manual, which by the way, comes with the unit.