Aircraft altimeter analog unit item appears to have never been hooked up very clean no dust or dust or dirt has a couple of minor scratches with cable cord I no nothing at all about this unit it was giving to me from a friend from another country and he told me it had value maker of this model I have no idea but it has the name BARO on the knob and alto calibrated to 20000 feet and model on the back 18-8-2020 if anyone knows information I can use the help thanks