The WORLD'S BEST EGG CANDLER!! Unlike conventional egg candlers, this product uses a hi-intensity Xenon lamp that produces a powerful, bright white beam. The fiber optic curved head provides a completely cool touch to the egg with no heat to damage the embryo. These candlers are perfect for small eggs (finches, canaries, budgies, cockatiels) and enable the eggs to be candled inside the nest without ever lifting them out. Check for egg fertility only 5 days after laying.