It is a bargain
It is hard to imagine a better bargain for process control. I have been using PID controllers for years and for most applications, you don't need proportional control. My typical PID with SSR control costs about $300.
This is a less sophisticated controller and is a typical bang-bang controller. The control is referenced for cooling which means if you want to turn on a heater you set the heater turn off temperature in the set point and the heater turn on point in the hysteresis band. For example, I am using this for my green house where I turn on lights to keep the plants warm. The set point is 42F. At temperatures above 42, the heater is off. The hysteresis band is 2 degrees. Therefore, the lights turn on at 40F.
The quality is very good too. For home projects like green house heaters, this is the ticket!
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