ECOWITT HP3501 - Graph Mode for Optional Sensors(S)

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On this mode you can set the following:

View sensor ID, signal strength and battery power condition. 1-4 bars
means 1-4 successful successive signal receptions without missed ones.

Register the sensor when offline.

Enable or disable the sensor.
5.9.2 Graph mode for optional sensors(s)
In each optional sensor(s) display mode, hold the GRAPH button for 5
seconds will enter graph mode: