A/F/R gauge for tuning

An Amish wagon was going down the road by our place, and the horse was "exhausting", a young feller jumped out with a bucket and shovel. He began scooping up the exhaust,and putting itin the bucket. I walked to the road and said "Thanks, but, you don't have to do that.

He said " I'm not doing it for you, I'm data logging..."

After sniffing the bucket, he said " I think she's a little rich. "