You’ll need to use this in conjunction with a thermostat. Check out the Inkbird ITC-308. That is a dual stage, pre-wired, digital temperature controller. Dual stage means it can control both a heating and cooling source so that you can really dial in temps.
As of this posting eBay Seller theweekendbrewer, currently a Top Rated Plus Seller, is selling this for $18.99 with free shipping.