Review on 🌡️ Wireless Indoor Outdoor Thermometer - 2 Pack Room Thermometer Hygrometer for Every Space, No Battery Required - Temperature Humidity Monitor Gauge for Home Office, Car, Greenhouse, Baby Room by Aaron Carney

This thermometer/hygrometer accurately measures indoor temperature and, as far as I can tell, humidity too. I bought this to use with a humidifier I bought due to the dryness of the air during the winter months. The bonus is that houseplants love it too. I also like that it doesn't require batteries, unlike the digital ones I've been looking at, and it's factory calibrated so I don't have to mess with it.