I wonder if one could modify one of the old bi-metallic forced air furnace 
thermostats to do the job?  I would suggest a relay or contactor for the actual
heating elements with the thermostat used for the relay control......

I believe these "bottom end" controllers are still available in home building
supply houses. Calibration, it is suggested, would be left up to the user.....

  Cheers,

   Rich S.

---- Original Message ----
From:		Dr Skip
Date:		Tue 6/26/07 20:16
To:		Microcontroller discussion list - Public.
Subject:	Re: [EE] Cheap solution for environmental chamber

Either one of those electric coolers that heats/cools (probably only
good for the heat side for your range), or a plain cooler (even
styrofoam) with a 110v bulb and a portable thermostat (I got one at
Sears one time - ready to go and operate a 110v device via line cord and
plug) in it.

-Skip

David Novak wrote:
> I need to test a product at hot and cold temperatures. Can anyone suggest a
> cheap alternative to an environmental chamber?
>
> A small freezer would probably be fine for the cold, but what is a good
> solution for hot (50C)? I think a toaster oven would be too hot.
>
> Thanks,
> David
>
>   

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