Step 1: Parts
A tube just big enough for the egg to sit on top of it and for you to hold it and the egg. You can use toliet paper tubes or paper towel tubes for bigger eggs.
A light big enough to fit in the tube and bright enough to shine through the egg.
If your tube leaks light use black tape (electrical tape) to seal up the holes. You don't want a light that is too big because then you will have to use a lot of electrical tape to seal the leaks.
I am currently hatching 4 Bob White Quail eggs which are small eggs and that is why my candler is so small.