If the incubator doesn't have a hydrometer, then you will need to add one. Place it inside the incubator along with any other thermometers you might have in there. (hint hint) Bobs need 55% to 60% humidity during incubation. At lock down raise the humidity to 70% or 75%.Well got 29 snowflake bobs in tonight dropped one so ill let u now how it works out. Picked up a little giant incubator at tsc for 34 bucks and 12 gamble eggs coming soon temp is at 99.5 but how do u keep track of the humidity. This is what my 7 year old wanted for his b-day moms not to keen to it but kind of a win win for us. She has been threating to stop the pay pal account so better get more eggs ordered quick.