Walker Cat Master O2 Sensor Tester

Description

This is a Walker clean air cat master O2 tester. This battery operated unit comes in the box with instructions and I put in some new batteries to make sure it turned on. It had none in there and I think this is new and never used. Because I have been burned before with someone using diagnostic tools then falsely claiming it did not work this is being sold as is. You can see in the pic it turns on and there is no reason it would not work. If you have any question please ask before purchasing.