MTRRadonConcentrationMeasurementFeature Declarationstruct MTRRadonConcentrationMeasurementFeature TopicsInitializersinit(rawValue:)Type PropertiesaverageMeasurementcriticalLevellevelIndicationmediumLevelnumericMeasurementpeakMeasurement RelationshipsConforms ToBitwiseCopyableEquatableExpressibleByArrayLiteralOptionSetRawRepresentableSendableSendableMetatypeSetAlgebra