Review on 🌡️ AIKTryee Indoor Thermometer Hygrometer with Fahrenheit/Celsius for Humidors, Greenhouse, Garden, Cellar, Closet, and More – High-Quality Temperature Humidity Monitor by Candace Ramirez

It's pretty cheaply made, but for under $5 it's what you'd expect. The accuracy was right. It was within 5 degrees of actual. I wouldn't say you can calibrate/adjust this like the listing says when I bought it. The adjustment mechanism is simply to bend or relax the existing coil with a screwdriver by turning the dial hand around zero a few times and see where it returns. Like hit or miss.