Temps in frozen, anything that is dairy, usually the pallet of yogurt and milks, bannanas (grab one from the inside of the boxes if possible, the blankets they use to keep them warm dont do shit, so put the thermometer near the peel of the bannana so it will heat up quicker and so nobody calls you out for holding the bannana and being that guy in receiving that is a professional bannana warmer.
As for the app? I'm not sure, I use the computer and its menu.