Thank you Very Much for sharing your experience with the ovascope and giving me an alternative!I have an OvaScope (got it at the same time as my incubator), and while it's really neat to be able to see the egg that way, there are a number of limitations - I actually had to buy a very bright flashlight as well and use that almost all the time in addition/instead.
The issue is that with the OvaScope, you put the egg air cell down to view it. This means (1) you can't mark air cells, and (2), you can't use it with eggs that should be kept upright (e.g., shipped eggs). I instead had to put the egg in a carton air cell up (after weighing), mark the air cell, and then pick it up and hold the egg while candling to see if there is development. If I was feeling curious, maybe I'd put it in the OvaScope to see what it looked like (if it wasn't a shipped egg with a loose air cell), but it was pretty unnecessary.
I got this one (recommended in this thread), VERY bright - I cut a foam "doughnut" and taped it to the top to cushion it:
http://www.amazon.com/APG-Lumens-Zo...&redirect=true&ref_=oh_aui_detailpage_o05_s00
I actually got more than one, for when I need to candle dark eggs down the road.