Cheap, easy to use. standard product. They are available for around US$2 each and are shipped from China by slow boat. This is a good price that ships immediately.
Govee Temperature Hygrometer Thermometer Greenhouse
8 Review
π² Pin-Type Wood Moisture Meter Detector
10 Review
Weather station hygrometer for home indoor household thermometer with humidity measurement ULBI H1
35 Review
Discover Hidden Thermal Changes with BLACK+DECKER TLD100 Thermal Detector
8 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
π‘οΈ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review