I have a brinsea 20. Its not digital. I keep a digital thermo/hydrometer in it. The temps are from 99 to 100 and I don't have a problem with it hurting the chicks. In real life the hen don't stay on the eggs all the time. She gets up to eat and potty and stretch her legs so the temp will drop.This is my very first incubator, I have the Brinsea Mini Advance and it SEEMS to be absolutely perfect. Though I'm curious how accurate the built in thermometer is? I added a second one and it was about 2 degrees difference and I've read that just a degree off can ruin your chicks so it scares me.
How has your guys experience been with incubators, does it read the correct temp?