I am going to make a 2nd rack out of a charcoal grate for my kettle grill and I'd like to be able to monitor the temperature on both racks, but I only have a single thermometer (Maverick Redi-Check ET-732) which has a pointed food probe and a round probe for measuring air temperature. I know that companies sell 'universal' probes, but is there really anything special about them compared to the food probe that came with the unit? Is there a reason I cannot stick the food probe through a potato to measure the air temperature?