ok so what i did was drilled or poked a small whole thru one end of a kleenex box about the size a wood pencil could stick thru then i have an LED flash light i stick inside the box against the hole. with all the lights off i hold my egg ( fattest end toward whole ( you know the end with the air sac)) And thats how you candle you can see movement by day 8 to 10 if viable and depending on the color of the egg you could even see your yolk as soon as you get it! its fun and veery exciting when oyu can see babies kicking and jumping in your eggs!