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# HKMetadataKeyAppleDeviceCalibrated

The key for metadata indicating whether the system had data from a sufficient amount of calibrated sensors when recording the sample.

```
let HKMetadataKeyAppleDeviceCalibrated: String
```

## Discussion

This key takes a Boolean value. If it’s <doc://com.apple.documentation/documentation/Swift/true>, the system has enough high-quality data to make an accurate estimate. If it’s <doc://com.apple.documentation/documentation/Swift/false>, the system provides an estimate based on data that may be less accurate.

The key is read-only.

---

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