In short: Yes - the device immediately shows the temperature and humidity on the display, you can set it up without a hub and read the values.
Details: The Tapo T315 has a built-in E-Ink/display that shows temperature, humidity, comfort indicator and battery status; after inserting the two AAA batteries, the readings appear directly on the display. However, TP-Link points out that the Tapo hub is required for "smart functions" such as remote monitoring, data storage/export, notifications and automations; these functions will not work without the hub.
Note on measurement: The measurement accuracy is typically ±0.3 °C and ±3 % RH, data is updated approximately every 2 seconds. If you want to use the device purely as a local reference device without app/remote access, a hub is not necessary.
The Tapo hub is essential for the device to work with its smart features, such as remote monitoring, home automation and data export. Without the hub, these functions are not supported, as the thermometer-hygrometer communicates via a proprietary radio connection that requires the Tapo hub. The device does not work on Wi-Fi alone and must be connected to the hub to be fully used.
No, the device does not need WLAN to work. It uses a wireless connection in the 868 / 922 MHz frequency band and requires a Tapo Hub for smart functions such as remote monitoring and home automation.
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