On Board Diagnostics Reader, demystifier

From Jaycar I spose all you guys have one of these:

OBD II LCD Scan Tool


If you have a late model car, it will probably have an OBD (On-Board Diagnostics) connector. If it was manufactured after 1996, it will support the OBD II protocols. This OBD II Scan Tool supports the CAN (Controller Area Network) protocol and can be used to diagnose prior to repair and to verify a repair after service. It also turns off check engine lights, erases diagnostic trouble codes and resets OBD II monitor status. Save time and money on repairs, identify problems with a used car before buying or analyse engine performance data.

Can be used to check the VIN number when purchasing a second hand car!

Features:
* Suits all 1996 and later OBD II compliant vehicles
* Supports multiple trouble code requests: generic, pending, and manufacturer specific codes
* Retrieves VIN (Vehicle ID No.) on 2002 and later vehicles
* Two line backlit LCD
* Dimensions: 115(L) x 75(W) x 20(D)mm
* Cable length 560mm

NOTE:
For the most current DTC Library and user manuals please download from the following web site - http://www.auteltech.com/
QTY
1+ $129.00
3+ $115.95
6+ $102.95

CAT. NO. QP2294

Seems to me to be a desirable bit of kit, handy to have even if you are getting your car serviced by a 3rd party, you would know exactly the problem before you had anyone do any work.