The floats are not covered or protected in any way though, so it can not be used in a display. I'm asking $15 for it and picked up in manhattan, although I could ship if needed (at your expense).
I bought a used Tunze Osmolator w/old style rails I paid $110. I bought it for a tank I was gonna setup but I'm no longer doing it so I'll let it go. I tested it and it works perfectly yours for what I paid.