The 4" will be fine! Just tape it to the bottom and put some water bottles on top. You can hang the probe in the middle or tape it to the Flexwatt. Do not put it in the eggs box. When the eggs are close to hatching, the temp. in the egg box will rise, and this will throw off your temp. Just keep a thermometer probe (AcuRite) in the box and monitor that! With this setup, you should be good!
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