I rate here alone device, the long-term experience with it and not the seller. The device does what it should. It reads both while driving and when the engine is only running the engine data reliably. However, one needs the appropriate PC software you look into tube. My version 3.24. bought from the 5.8.2012 at Amazon, can be switched from English to German. The available Internet software can be installed, however, not. The installation terminates without error. Hence my conclusion: Who does not need the PC software will be well served with this unit. All others should take up a high end device. Due to the non-functioning software only 2 points.