That is a good idea!I only use air temp to get a rough idea, as soon as air temp is in and around 99.5° I dial in and monitor incubator temps with a 'fake egg' from that point on... Since I have been doing a lot of peafowl this year it's a 4oz baby bottle filled with water (a little larger but not too much bigger than a peafowl egg) the nipple is installed backwards and it's a newborn nipple so it has a single hole... I can either leave the thermometer in there or take it out, the nipple seals back up pretty well it doesn't really leak at all, this bottle stays in the incubator 24/7 and I use that to monitor the temps vs air as it more closely mimics the average internal egg temps...
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I use a Brinsea spot check and a water weasel.
The water weasel probe is in the back.