I have been using a Maxiscan MS509 for a couple of years now and it's faultless. It's also a fake copy. I state this as a genuine one at the time was over £150, a good friend and fellow mechanic put me on to the copy version which was under £50, today they can be below £30 if you can wait for them to come in from China.
I am cautious to recommend fake items unless they work faultlessly and this does. The difference, the only difference, is the genuine one will store data to transfer to a laptop for later analysis, the fake does not have a battery and user groups advise not even trying one as it has been known to cause issues.
It works with all major protocols and I have used it on many Fords (including Duratec +4's and a Roadster), Mercedes and a Jaguar, all perfectly. If all your after is a read and clear the code machine that gives you the option to live gather data and observe live values its clear screen and simple logic in use take some beating. Your choice but just looked and some are available under £25. If your into it there is even a graphic display of values that make diagnosis much simpler.
