On my 2nd set of eggs for hatching, my first batch I tried candling with DIY candling aids, I would have told you based on candling pictures I looked at that I only had 2 eggs out of 7 that progressed. Wouldn't you know it, all 7 hatched as healthy as can be. Hence I said so much for my expertise, I need better tools. In my defense most of the eggs were darker brown or blue, so they were hard to see through. The guy at Brinsea I talked to said the Ovascope was as good a candler device as there is available, anyone with experience with one that can get me jump started. By the way, this is day 4 of this hatch and the Ovascope should be at my door when I get home from work today.