Why the external readings of the TH30S-B sensor just show up for a few seconds then vanish?

When you are using the WS1 Pro device and connect the TH30S-B external sensor, you usually go to the Settings page to enable the RS485 button first. Please note, you only need to enable the RS485 button if there is only one sensor is connected. If you turned on other buttons, such as external sensor, RS485 S (for soil sensor), the data on the device screen will flash automatically.

Therefore, please remember to enable just the corresponding button for the sensor you're using.

Tips: For TH30S-B and Soil sensor, they can only be connected to the bottom USB port (USB2) on WS1 Pro device. WS1 device doesn't support it.