When this first powers on the lights on top flash, it beeps, and then the screen says " Missing Sensor O2".  I don't know how to test it beyond this and so I am offering it AS-IS. I don't know if it has any sensors but if it does I would assume that they would be due for replacement.  It does come with a battery pack that takes 4 AA batteries but batteries are not included.  Everything that is included is shown in the pictures.

F6-6

fdk 81003228