# Your first serial

> Open the produced unit: timeline, as-built record, final test, SBOM.

Every unit you produce gets a serial number and its own page. This is where you see what the unit is made of and what has happened to it.

## Find the unit

Use either of these:

- In **Build Orders**, select the order, open the **Units** tab and select the unit.
- In **Inventory**, open the serials list and select the serial number.

A unit that passed its final test, or had none, starts as `AVAILABLE`. A unit that failed its final test is quarantined.

## What the page shows

The header shows the serial number, its status and its part and revision.

- **Timeline.** The timeline lists every event in the unit's life, oldest first: produced, moved, reserved, inspected, shipped, and so on. See [Serials](https://buildtrace.eu/docs/concepts/serials.md).
- **As-Built Genealogy.** The tree of components and lots that went into the unit, exactly as built. This record never changes after the unit is produced. It also shows the work instructions the unit was built to and the change orders that were applied or skipped.
- **Final test.** If the revision had a test plan, a table lists each check, the result, its limits and whether it was in spec. If the unit failed, the page says so. If the revision had no plan, the page says that no final test was defined.
- **Firmware** and attachments for the unit.

## Export the SBOM

Select **Export SBOM** in the header to open the unit's software bill of materials. The button needs the `reports:read` permission, and it does not appear without it. See [SBOM export](https://buildtrace.eu/docs/guides/sbom-export.md).