The NX 501 is a good OBD2 tester and has some great features that I like. It is very easy to use and has features like code checking and clearing, I/M readiness, data stream, freeze frame, 02 sensor test, evap system, on-board monitoring, battery check and also your vehicle information. The NX 501's long cord makes it easy to check codes without bending down. The USB plug also makes it easy to download to a computer. It's worth the money to be able to check the codes in your car. It also has a nice handy zip pocket to store your e-reader when not in use.
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