I have a Green Mountain big pellet grill and needed a smaller pellet grill for our RV.  It seemed the Traeger Ranger fit the bill.  After burn in, we tried some meat on low to get a good smoke.  Using a MEATER thermometer in the meat, the measured ambient when set to the lowest temp (165) was way higher on the order of 300+ degrees and all over and pretty variable; the meat showed the higher temp as well in that it started to cook.   When we set the point up to 400, it held the temp rock solid.  Hopefully this was something that the grill will fix in time as it seasons and spec'd in by Traeger.  Its probably pretty hard for such a small grill to maintain temp consistently on low heat tbh.  Still a wonder you can pack so much into such a small footprint as the Ranger..