I've been using cheap flashlight candlers and am thinking about the Brinsea ovaview or ovascope. Are they really worth it? Any other suggestions? Thanks! 

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ok great will leave them a few more days thanksYou can candle at the end of day 3. I usually do. You need a super bright light, and you will only see a small red dot floating inside, with may a few blood veins extending for short lengths out from the red dot. It's very difficult to see without a super bright light and you may or may not see this in all of them. Waiting until day 5 would be better.
I use a $30 flashlight I purchased from Home Depot that has 600Lumens. You won't find any light brighter than that unless you rig up a car battery and a headlight in a paper-towl tube! You can use a toilet-paper cardboard tube on top of the flashlight, being careful not to drop the egg through it. They measure lights in Lumens. You can find a much better flashlight with a lot of lumens so you can see through those eggs, than wasting money on an expensive candler device. The more Lumens the light has, the better you can see through the egg. At 600 Lumens, it didn't take me long to piss off my wife with it! I was in trouble for 2 days.....lol...I hope that helps you pick out a good candling device.