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Depends if they work correctly. You never know with the older models (that one looks beaten to heck!). You have to be VERY careful with them though. I burned the CRAPERS out of myself with one of those the other day. They don't have a Blowing-Heater like the new ones, they have a Heating-Coil at the top that gets VERY VERY HOT. And it's completely exposed. I have a scar to prove it! (OUCH). LOL
My friend is not using hers anymore, as it won't keep stable temperature and she can't hatch anything with it.