First off you need to secure your probe on the heat tape- I used a dab of silicone rubber but don't cover the end of the probe obviously. Second if you leave the top drawer out then all the heat will easily escape off the (I'm assuming flexwatt) cuz there is a draft believe it or not I don't care how deep the drawer is but they have moving air cooling off the flexwatt though. So if you have a tub on top of the probe then theoretically this is setup identical to the other tubs in the rack so temps should be very close to the thermostat setting. Personally in my boaphile rack the temps are one degree difference. Third you have to have a temp gun, it is the best tool you could ever own.
Bob

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