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.
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.