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I don't believe there is any certain brand that is more accurate than another, it just depends on how they are made. Some hatcheries sell hygro/thermometers that are supposed to be accurate to within +/- .5 degree, maybe you should check them out. I think McMurray has them, though not sure...

I use an accurite thermometer/hygrometer that works fairly well. You can calibrate yours, to get an idea of far off they are. It also depends on where you have yours at in the bator, and whether or not you have a fan. I used to put tons of water in mine,before I added the fan, and it would never...