MS 509 Autel MaxiScan OBD-II/EOBD CAN Scanner Auto Diagnostic Tool -with Plays back live sensor data
When i recieved it was surprised how easy to use it was.Did the same tests as some of the more expensive models although you have to know what some of your sensors readings should be to test them.It doesn't come with a 9 volt battery for saving readings you'll have to get one.But for basic engine management readings you cant beat it for the price!!! It have saved me hundreds of dollars already.