I have it and the torque pro app, it does loads will read boost maf a/f revs speed fuel pressure voltage O2 reading and VloltGe intake temp coolant temps, and it can read most codes and clear them not bad for a tenner that the app and dongle
Gotta make sure your car is OBD2 compatible though, some early Leons, like mine, aren't compatible!
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Thanks for all the replies, I have bought an elm327 off ebay for about £6 i plug it in and have tried to pair it with my laptop and 2 different android phones and nothing happens...