I decided to try it this weekend and i'm doing a lump of pork shoulder.
The software showing a graph of the timeline, i'm not using the fan but the software shows it functioning:

The controller running from a USB battery and a probe used for ambient temp:

The pit with pit probe, my smokey tube thing and the pork:

Overall i'm impressed with the heatermeter and i'll be using it from now on. I've had it running on my tablet, android phone and iphone.