Unit of measurement

Configuration
4

Add a customize include under homeassistant to your configuration.yaml file if it does not exist.

homeassistant:
  customize: !include customize.yaml

Create the customize.yaml file in your /config folder and add the following inside it:

sensor.rain_total:
  unit_of_measurement: 'mm'

Assuming that sensor.rain_total is actually the sensor entity_id you need to change the unit of.

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