High Intensity Candling Light.
Monitor the development of fertile eggs without the dangers of handling.
Candle any egg from the tiniest finch egg to the largest Macaw egg..even chickens and goose eggs.
Use the Probe-Lite right in the nest box to determine if eggs are fertile without touching or removing the eggs.
Find tiny hairline cracks. If found in time, cracks can be repaired and the chick saved.