I believe the reason for temperature probes in glycerol vs air temp is to better reflect the temperature variations your units experience while in storage. If you think about it, the temperature of a unit stored at a given point will not change as rapidly as the air temperature. If you are monitoring the second to second (or even minute to minute) air temp changes in a unit you are going to go crazy trying to regulate them. All of our temp probes are in glycerol for just this reason. The manufacturer of the platelet incubator has likely performed extensive studies to be sure their products maintain the temp of the units held within. Call Helmer to ask what their recommendation is for the temp monitoring process. They are very helpful.