After reading all the posts on checking the duty cycle, I purchased a Sears Multimeter model #82139. My initial readings on closed loop operation was approx 35% indicading a rich setting. I suspected something was up when the number would drop while turning the adj screw CCW. The only way I could get the number up was to richen the mixture by turning the screw CW (totally backwards).

My local Indy hooked up his dedicated duty meter and said I was lean at 65%. He turned the screw CW and set the mixture at 45%. I tried my meter again and found out the only way I could get it to read accurately was to put the black probe into the #3 pin at X11, and ground the red probe into the #2 pin. (totally backwards again).

To pre-answer some questions:
Batteries - in correctly
Leads - in correct sockets on multimeter
Beer - still in the fridge

I contacted the meter manufacturer and we verified that the meter is functioning properly otherwise. He suggested to remember to reverse the leads in the future. I could still return the meter, but would they all behave the same? All I have read here indicate that the #3 pin goes to the red probe.

Anybody else run into this?