nymea/libnymea/interfaces/cosensor.json

{
    "extends": "sensor",
    "description": "CO (carbon monoxide) sensors. Measures co in parts per million.",
    "states": [
        {
            "name": "co",
            "type": "double",
            "unit": "PartsPerMillion",
            "minValue": 0,
            "maxValue": 255,
            "logged": true
        }
    ]
}