In our opinion that would be The FA series of averaging sensors from ControlTrends Award Nominee ACI. Forget the brass remote bulb, the clever engineers at ACI figured out an easier way for you to get accurate average temperatures across things like cooling and heating coils. And yes, that is 2012 ControlTrends Awards nominee, Barry Gordon in the video. For more information on ACI products you can contact the control pros at Stromquist & Company if you are located in Georgia or Florida, or one of our affiliates, like the Jackson Controls,or M & M Controls, at Controls Group North America.