We run our incubator with a Helix 1500 wat system, not because I need that much output, but mostly because it reads in tenths of a degree, and I like the fine adjustments that can be made with it. I have my Helix set at 89.6 degrees. It will typically fluctuate .2 degrees plus/minus. I then have 2 Accurites that are sitting in different spots, with the outside probes sitting in 2 other spots. This allows me to see the temps in 4 different locations of the incubator to compare with the reading on the Helix. For the actual egg boxes, we use an aquarium thermometer, that is about the size of 2 quarters and has a probe that is about 24 inches long. The thermometer has a suction cup that we stick on the front of the egg box, and run the probe around back and stick it in the box from the rear. These thermometers are precise to .1 of a degree. Most of these thermometers (we have 12 of them) read between 90.2 degrees and 88.8 degrees. We don't put one on each box, but spread them throughout the incubator. As for the brand name, I'll have to check when I get home, as I can't remember it right now. I'll try to get a picture up tonight as well.

I hope that helps,