I use the fish tank thermometers from WalMart.  I know my thermometers based on the hatching results.  The Easter Hatch was a little late. THe temperatures ran at 100 or 101. BUT I had them placed on the center of egg cartons and rocked the egg carton. THe net effect was a slightly late hatch. The LG despite the PC fan acts a bit like the still air.
	
		
			
		
		
	
				
			
	
	
	