I have an incubator which I know to be slightly off. The thermometer that is built in will read 93F, While a digital Thermometer will read 101.1F. That's an awful big difference! So I added in an extra thermometer in the same place and height that wasn't digital, it was a food thermometer. Its reading 97F-98F on average. No eggs in it of course, but which can I trust? I have only one last thermometer that came with the incubator. I haven't taken a reading on that. The eggs come in tomorrow, so I need to get my final settings done tonight so I have a day to monitor it "at temp". Which one is more trustworthy?