> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/more/software/label-your-samples.md).
# Label your samples
Give each sample its dilution, label and sampling time before you measure.
Access stores each result together with the information you give it. With a dilution, a label and a sampling time, Access calculates the concentration of your undiluted sample and plots your samples over time. Your BactoBox® cannot record this information on its own.
## Fill in the annotation fields
Click the tag icon next to the program buttons in the bottom bar. Four annotation fields appear above the buttons. Fill them in before you press Measure.
The annotation fields, filled in for a 1:100 dilution of a sample from Bioreactor#1.
| Field | What to enter |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| *Sampled at* | The time you took the sample from your culture. |
| *Dilution* | The dilution factor of your sample vial. Enter `100` for a 1:100 dilution. |
| *Label* | A name for the culture the sample comes from, for example *Bioreactor#1*. |
| *Measurement group* | The group the measurement goes into. See [Create and open measurement groups](/more/software/create-and-open-measurement-groups.md). |
## Use one label per culture
Access plots one line per label. Give each culture its own label, and use the same label for every sample from that culture. If you run three bioreactors in one measurement group, label them *Bioreactor#1*, *Bioreactor#2* and *Bioreactor#3*. A label only applies within its measurement group.
## Set the time you took the sample
*Sampled at* decides where the measurement sits on the time axis. Set it to the moment you took the sample from your bioreactor or shake flask, not the moment you measure. Preparing and measuring your sample takes a few minutes, and those minutes are not part of the growth of your culture.
Use the − and + buttons next to the field to adjust the time one minute at a time.
## Correct a measurement afterwards
You can change *Sampled at*, *Dilution* and *Label* after the measurement. Open the measurement group, or click *Measurements* in the side bar. Click the cell, type the new value and press Enter. Then click *Save*.
Click Save to store your edits on your BactoBox®.
{% hint style="info" %}
### Your measurements are stored automatically
*Save* only stores the values you edit yourself. Click *Discard* to undo edits you have not saved.
{% endhint %}
---
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