Check egg fertility and development with this compact LED candler. Simply place an egg against the lamp opening in a dark space to see inside clearly—the bright, high-penetration light reveals whether your eggs are developing properly. Built from durable stainless steel with a portable design, it works on all poultry, including chicken, quail, and duck eggs. Runs on one AAA battery (not included). Perfect for small-scale farmers and students monitoring the incubation progress.