condition report  ---  used not tested BUT the hands do move i used a Plires KNOB missing for that. DID A TEST WITH MY METER AND IT SEEMS TO HAVE A POSTIVE GROUND BUT I MAY BE WRONG hooking a meter to the positive post and the mounting brass screws on the back are in connection with the post ??? scuffs and scratches dirty use marks  

it does have a aluminum housing non Metalica the reading i did says they were both 6 and 12 volt systems  FREE SHIPPING