I have had mine in my Genesis 1588 while testing the incubator's temperature and humidity without any eggs for over a week now, and it's holding a consistent temperature of 99 degrees; that matches the four thermometers in the incubator with it. So far, I say that it's great; it lets me know that this incubator will keep the developing chick at the exact temperature throughout the entire hatch. I am learning from my two hygrometers that I'm going to have to adjust the size of the water surface/holder to lower the humidity some. I have not tested the humidity yet for the final three days using the extra water holder space. I might have to cover some of it to reduce the surface. I have also learned that a cup of water goes in the first part, and that it will last for six days. The second part holds one and a half cups, so there will never be any need to add water during the last three days if both holders are filled when the egg turners are removed on the eighteeenth day. I haven't tested both water holders' being filled with water yet for the last three days, so I don't know yet if I will have to adjust the water surface size to reduce the humidity the last three days.
I have two Geness 1588's, and I have only begun checking one's accuracy so far. Hopefully, I will get the same measurements on the egg-o-meter, hygrometers, and thermometers when I actually have eggs in the automatic egg turners.