Climate Sensors
Shelly sensors measure temperature and humidity and show their trends over time. The WiFi and Bluetooth versions are battery-operated and can be placed on a shelf or wall without any work. The Plus Uni module connects external probes. For hosts, they are useful for knowing if the house is too cold before the guest arrives, or if an empty property is at risk of humidity in winter. Together with a Shelly socket or relay, they allow you to turn on heating or a dehumidifier only when needed. These are simple devices to mount on your own.