Oh, forgot to say... I BETTER have a good thermometer. I drove all the way to Reno (1-1/4 hours) to a cigar shop and paid I can't remember exactly how much, I'm thinking it was somewhere anywhere between $10 - $20 for the thing. I had just had a very bad experience with a hygrometer that kept telling me I didn't have enough humidity. I had just moved to this desert the summer before and so I really had no idea. So, to make a long story short... very bad hatch... and yes some hatched. Many had crooked toes, others were kind of mushy and still others had some pretty big issues with the tendon of the hock joint. I replace the battery every spring.
Just checked my thermometer and it says it is 98* in there. So, do I just put the #7 toggle up?
Move the one that is up down and then move the next highest one up. It should be 6 down and 7 up. You want to get closer to 100, but give it 24 hours to stabalize. for the next hatch, just go up one number and see what happens.
You are fine tuning the hatch so you do not want to make big changes.
98 is too low. Safe incubation is 98.5 to 100.5.