> For the complete documentation index, see [llms.txt](https://docs.rishvi.co.uk/linnworks/llms.txt).
> Use it to discover all available pages before exploring further.
# Scale
Connect and configure an electronic scale with Odoo Point of Sale to weigh products and automatically calculate prices during checkout.
## **Prerequisite**
To use a scale with POS, an **IoT system** is required.
## **Configuration**
### **Connect the scale**
1. Go to **POS Settings**
2. Scroll to **Connected Devices**
3. Enable **IoT Box**
4. Select your scale in the **Electronic Scale** field
5. Click **Save**
**Tip**
You can also access these settings by clicking the menu icon (**⋮**) on a POS card and selecting **Edit**.
### **Configure products for weighing**
To sell products using a scale:
1. Go to **Point of Sale ‣ Products ‣ Products**
2. Create a new product or open an existing one
Then configure:
- Enable **Available in POS**
- Set a **Sales Price per kg**
**Note**
This requires the **Units of Measure** feature.
To enable it:
1. Go to **Inventory ‣ Configuration ‣ Settings**
2. Activate **Units of Measure**
1) In the **Point of Sale** tab:
- Enable **To Weigh With Scale**
**Important**
The unit of measure must be set to **kg** to comply with **European regulations**.
## **European compliance**
When using scales in commercial environments, your system must meet specific regulatory requirements:
- Support at least **three decimal places**
- Use appropriate units (e.g., `kg` instead of generic units)
- Apply correct rounding rules
If the setup is not compliant:
- A red scale icon appears as a warning
- Click it to view issues
- Select **Apply changes** to fix them automatically
Once compliant, the icon turns green.
### **Additional requirement**
Both the POS screen and **customer display** must be at least **6 inches** in size.
## **Using the scale in POS**
1. **Open the POS register**
2. Select or scan the product
3. Place the item on the scale
4. Wait for the weight to appear in the popup
5. The price is calculated automatically
6. Click **Order** to add the item to the cart
7. Remove the item from the scale
**Important**
Ensure the scale resets to **zero** before weighing a new item.\
If not, the **Order** button will remain disabled until the scale is reset.