This is my third incubation. I am SO frustrated. Placed 12 eggs in today. I have four thermometers and 2 humidity gauges and all have different readings. The Brinsea digital is lower than the other two by 3 degrees. The two others are from Petsmart. One if a $29. combo therm/humidity and the other is a regular combo about $15. The plain old thern that was purchased for $5 at Tractor Supply reads the same as the $15 regular combo . The bator is a Little Giant that is equipped with a fan and an egg turner. I am so frustrated. Which do I believe?