They're great, nice and small, work with no issues and have batteries for about 5 months now. Yes, they're slightly different and slightly inconsistent, but no more than a few degrees or percent. And even then I've compared them to more accurate means, and they're still hardly wrong. So for $7 they do a great job!
Xiaomi Mijia Hygrometer Bluetooth Global Thermometer, white
32 Review
Precise Humidity Control With Xikar PuroTemp Round Digital Hygrometer, 10-Second Refresh Rate
27 Review
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor
59 Review
Wintact Handheld Anemometer Water Resistant, Small Digital Wind Speed Meter Gauge, Pocket Air Flow Tester With Measuring Wind Temperature 14℉ To 113℉ For House HVAC Outdoor Kite Boat Sailing Surfing
14 Review
COMFYHOME 3 IN 1 Portable Evaporative Air Cooler - 60°Oscillation, 12H Timer & Remote, Windowless Room AC For Bedroom Home Office
11 Review
White Senville Dual Zone Mini Split Air Conditioner Heat Pump, 28000 BTU, Alexa Compatible - SENA-30HF/D
21 Review
Stay Cool With COMFYHOME 3-In-1 Portable Air Conditioner - Efficient Evaporative Air Cooler For Home And Office
11 Review
Split system Roda RS-AL09F / RU-AL09F
37 Review