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I am on my first batch in a Brinsea 28 EX and have found the temp and humidity rock steady. The EX was definitely worth it. The temp range has only been .4 degrees according to my remote sensor. And humidity is fun to watch. Once it gets a couple percent low the little pump puts a drop of water in and you can see it rise then briefly settle before the next drop hits and it climbs again. Then it sits for awhile until the cycle repeats. See the pictures below. My only criticism of the 28 and 56 was no pad for the chicks tp hatch on like the mini 7 and maxi 14 have, We will use shelf liner to solve that. Day 4 down , 17 to go.
I have left my Brinsea at the factory settings. I put the sensorpush in one of the racks in place of an egg and it kept the last egg from falling over. I usually use nice round rocks as place holders. When transitioning to the hatch i tucked the sensor to the side in one of the slots where the racks normally sit. My sensor push usually sits around 98.5. Yours seems low. might want to put some others in for a spot check to see who is right. 4 degrees is a lot.
Once you are happy what the actual temp is then you can adjust the sensor push and it will save that setting. I added +1.0 F and it stays right at 99.5 to 99.6.