I don't use probes. I use acurite thermometer/hydrometer (link below) for ambient temps and an IR thermometer (link below) for floor temps. I really like this model cause it has converging laser beams which allows you to hold it at the ideal distance. You can also just hold the trigger pressed and move it around and it gives continuous readings. Also has max reading.

http://smile.amazon.com/AcuRite-0061...ywords=acurite

http://smile.amazon.com/Etekcity-Inf...ity+dual+laser