Get the egg Candler to test your fertile eggs from any brand of Incubator or Hatchery , once your eggs have been in the Incubator for at lest 7 to 10 days you can place your eggs on this Candler to check which eggs are good and not good, Test 132 eggs all at once with just a switch on and off . Comes complete and easy to use and move around . Test 132 eggs all at once .