This is one of the best mate...ask Stu who runs this gaff!

The lamda has done like 100 miles of work!

This is a pro use meter..i used it to gauge how good the off the shelf map i got was..and it was for a 500+bhp engine..As you will know the air/fuel is the most critical part of mapping..this is a wideband unit that accuratly tells you what your engine is doin.