i have it set to turn off at 100° but to turn back on at 99°... i have a digital thermometer and it tels me ambient temperature inside the bator... it fluctuates from 98-101°... but i do have two 1" holes on the top of the bator for fresh air... if i cap them off, it will hold to 99-100° perfectly... but i like the fact i have two giant holes for fresh air... no problems with humidity either, but i have to be right on it... a couple of times a day... 
also... my room isn't stable... at night it hits 45° and 80° days... so there is no way i would've been able to have like an hovabator with a wafer in there or water heater thermostat... my room is a non insulated garage really... but it's cool, when i build a bigger bator, i'm going to have it in the chicken coop where it should be warmer at night, but i'm going to use a controller anyways...
hth...
edit: i forgot that i also have a water wriggler thing with another thermometer in is and it stays at 99.5-100° all day... so i guess when it comes down to it, i get a -/+0.5° egg temperature fluctuation with this incubator... i'm happy with it... best 100bucks i've ever spent...
	
		
			
		
		
	
				
			also... my room isn't stable... at night it hits 45° and 80° days... so there is no way i would've been able to have like an hovabator with a wafer in there or water heater thermostat... my room is a non insulated garage really... but it's cool, when i build a bigger bator, i'm going to have it in the chicken coop where it should be warmer at night, but i'm going to use a controller anyways...
hth...
edit: i forgot that i also have a water wriggler thing with another thermometer in is and it stays at 99.5-100° all day... so i guess when it comes down to it, i get a -/+0.5° egg temperature fluctuation with this incubator... i'm happy with it... best 100bucks i've ever spent...
			
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