Egg Candler, Egg Candler Tester 9 Lamp Cool Light Easy to Operate, Durable Safe Egg Lamp Incubator with Lanyard for Schools Laboratories Breeding Stations

A good flashlight will do the very same thing, the rubber piece is useless in my opinion. Save yourself some money, buy a good flashlight instead

This thing is a piece of cr@p and should be avoided at all costs. When I loaded the three AAA batteries into the thing that holds them, it wouldn’t fit back into where it came out of. I did force it and screwed the lid bavk on and —doesn’t work. I opened it to remove the battery holder. Haha. Because I had to force it in there, there was no way it was coming back out. There are other options out there. Skip this garbage.