Digital Temp Controller/Sensor

Hello peeps once again, what i was thinking was that i would like to have a digital temp controller/sensor. That way there i know what my temp will always be at since its in a small space and i dont want heat to be an issue. Can someone help me out witha link for a good quality one please. I would also like for it to have a sensor as well so when it gets too hot a secondary fan will kick in and cool the space down. What do you think of this idea?/ I see it on others grow rooms. Also when im setting up shop where does the ballast sit?? Out side of the box or in?? I know if its in a closet it would be in the closet. Thank you

so anyone have any ideas of what i could use for the monitering of the temp!! I would like a digital temp reader!! Thansk

the ballast can go anywhere. ideally its not in the room because it throws off a lot of heat.
get this.
i use it to control my fan for my air cooled lights.
when things hit 85 degrees, it kicks on and cools for a few minutes.
it plugs right into an electrical outlet and then the fan plugs into that.
it isn't digital, but anything with a readout is going to cost you a shit ton.
i just have a digital thermometer on the wall next to the probe so it will read the same.
plus with the thermostat set, i know that things will always be at 85 degrees.

thanks man!!! I was thinking something likethis but this is from the UK and its total differant voltage and shit so i need to find one from the USA or here is Canada!!

DubRules said:

the ballast can go anywhere. ideally its not in the room because it throws off a lot of heat.
get this.
i use it to control my fan for my air cooled lights.
when things hit 85 degrees, it kicks on and cools for a few minutes.
it plugs right into an electrical outlet and then the fan plugs into that.
it isn't digital, but anything with a readout is going to cost you a shit ton.
i just have a digital thermometer on the wall next to the probe so it will read the same.
plus with the thermostat set, i know that things will always be at 85 degrees.

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85°F is pretty much the hottest you plants will grow alright in. If you have a thermostat you should make the temps stay 78°F all the time, that is the best for growing