Regrettably I do know 105 is too warm however that is the lowest I could get it on. And I make sure he isnt getting burned regularly so for the time being it will have to do. I use an accurate thermometer/hydrogenate. Actually i really messed up on the 88-90. Thats not right at all. Its usally varies from 78-84. Sorry I could barely remember the name of the thermometer. its been a long day.