I just bought two Brinsea Spot Checks for my incubators, and they're showing that my temps are fluctuating within about .5 of a degree at the most. If I set my Hovabator at 99.5, it seems to sometimes reach 100. I've had a few relatively successful hatches with this incubator, even when it was set at the factory temp and most likely getting way too hot. My other incubator is new, and it seems to be fluctuating within the same range. Is this too much of a fluctuation, or is this normal?