I am trying to identify an instrument that we have had laying around our house. I know very little about instruments and even less about this thing. It says made in the USA but other than that there are no other markings that can be seen on the instrument it self or in the instructions. I would also like to find out how much it is worth or where I can take it to find what it is worth, I live in the Sacramento CA area. Thanks and any help is greatly appreciated.