Here is another smart sensor that lets you log temperature and humidity. The Engbird Bluetooth Thermometer & Hygrometer is accurate to 0.5F and ±2%RH. It has a monitoring range of about 150 feet. The companion app is available for iOS and Android devices.
More gadgets like this: here
You get inner sensor and external probe to get started. The device holds data for up to 20 days. One smartphone can be used to monitor multiple sensors.
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