const units = await client.units.list();

{
  "items": [
    {
      "externalId": "temperature:deg_c",
      "name": "DEG_C",
      "longName": "degree Celsius",
      "symbol": "°C",
      "aliasNames": [
        "°C",
        "C",
        "deg C",
        "degC",
        "DegC"
      ],
      "quantity": "Temperature",
      "conversion": {
        "multiplier": 1,
        "offset": 273.15
      },
      "source": "qudt.org",
      "sourceReference": "http://qudt.org/vocab/unit/DEG_C"
    }
  ]
}