Thermostats are important equipments that are used in many different hobbies. Many good ones are available on the market but they can get pricey.
This is a video of how I made my digital thermostats for my reptiles and fish that allow me to control both heating and cooling components for $40.
The thermostat I used is made by inkbird, but it is basically the same as all the STC-1000 thermostats that are sold through places like ebay and amazon.
