Review on 2-Pack Mini Digital Hygrometer Gauge Thermometer – Indoor/Outdoor Temperature Humidity Meter for Humidifiers, Greenhouse, Reptile Plants, Humidors – LCD Monitor, Fahrenheit Display by Kevin Shimmens

It may take up to 45 minutes to accurately display the ambient temperature. I keep my house at 68° and my garage at 55°. Therefore I took all 4 of these devices back and forth several times as a test. They will eventually reach the right temperature, but it will take almost an hour to gradually reach it. So if you're trying to measure an environment where the temperature changes faster, this isn't ideal. If it's not a big deal then it's a good price.