is this thermostat good??

how come this one is cheap and i was watching this youtbe video some guy has it on both sides for cool and warm.
https://www.youtube.com/watch?v=6qLS8nlLu24

i couldnt fin any buttons to change the temptuer

also is there anyone tat has this and can u tell me abt it

this is what im talking abt:
http://www.petco.com/product/106227/...ermometer.aspx

thanks

Those thermometers do work well. A thermostat is different though, it regulates your heat source to keep your hot side where you want it and will be more expensive.

Not a thermostat but a thermometer you will get a temp reading you will not regulate them.