I managed to complete two hatch cycles on this incubator. Hatch No. 1 - Out of 18 eggs, 15 were fertile, so I pulled out 3 eggs, and allowed the balance of the 15 eggs to complete the full 21 day cycle. **There is no way to completely adjust the "humidity level," therefore, despite completing the full cycle, only 5 eggs hatched successfully.
I decided to complete another set of 15 eggs the 2nd Hatch Cycle. 12 eggs were fertilized, so once again, I removed 3 eggs. I allowed all 12 to go through the 21 day cycle. **I added a humidifier to the room, and only candled the eggs on day 10. The second Hatch rendered me 10 live chicks, the 2 left did not even pip. Therefore, the second Hatch was successful than my very first time around. So my recommendation are as follows: try to have a humidifier in the room you are using to Hatch the eggs, and do the candling at 10 days and the less handling the better. I learned a very valuable lesson the first time around. Thank you and good luck to all of you.