---
title: HMCharacteristicMetadataUnitsPartsPerMillion
framework: homekit
role: symbol
role_heading: Global Variable
path: homekit/hmcharacteristicmetadataunitspartspermillion
---

# HMCharacteristicMetadataUnitsPartsPerMillion

The unit of the characters is parts per million.

## Declaration

```swift
let HMCharacteristicMetadataUnitsPartsPerMillion: String
```

## See Also

### Parts Per Total

- [HMCharacteristicMetadataUnitsPercentage](homekit/hmcharacteristicmetadataunitspercentage.md)