Egg Candler Operation Instruction
 
It needs three good quality 1.5V batteries.
 
Ambient light requirement when using this egg candler: it's better in dark place or at night.
When checking whether the egg to be incubated is fresh or not, just put the bigger side of egg to upside, turn on the egg candler and aim at the top of bigger side, if the air chamber of it is very obvious, it means the egg has been stored for some time, at least more than 6 days, it's best not to choose it. The candling egg of small air chamber is fresh.
When candling the egg after it's incubated for4-13 days, vascular net can be seen, if it's transparent without vascular net, it means the egg is not fertilized, it shall be removed once such egg is found.