---
title: How to validate a field against a dynamic range (product metadata)?
description: This article will guide you in validating a number range in your flow form.
---
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# How to validate a field against a dynamic range (product metadata)?
## You can validate an input field against a min/max range that is pulled directly from your Product List (product metadata). This is ideal for quality checks where specifications change for each product.
In this example, the **weight** field is valid between `weightMin` and `weightMax`, or between `weightMax` and `weightMin2` as a secondary range:
- Valid (green): between `weightMin` and `weightMax`.
- Valid (amber): between `weightMax` and `weightMin2`.
- Invalid (red): everything else.
We will create three separate rules on the 'weight' field. The rules are checked from top to bottom.
**Step 1 — Build the first range rule**
```
(data["weight"]>=jobmeta["productWeightMin"])&&(data["weight"]<=jobmeta["productWeightMax"])
```
- Drag in the field from the form layout and drop it anywhere in the grey space
- Drag in the **greater than ≥** symbol
- Drag** Product Data **onto the 0 to replace it. Click **ratedSpeed** and select the product data e.g. **weightMin**
- Drag in the **AND** operator and drop it after the parentheses
- Drag in the field from the form layout and replace the **0**
- Drag in the **less than** symbol **≤** and drop it inside the parentheses
- Drag **Product Data** on the **0** to replace. Click **ratedSpeed** and select the product data e.g. **weightMax**
****
- Click on the **Valid** word
- Set up the **Form Status**, **Colour,** and add a **message** if needed.
**Note:** The Error status will not allow the user to submit the form until the field is valid.
****
#### **Step 2 — Build the second range rule**
Repeat the same pattern for the second range, referencing the field and the second set of product data values:
```
(data["Metadata"]>=jobmeta["productWeightMin2"])&&(data["Metadata"]<=jobmeta["productWeightMax2"])
```
#### **Step 3 — Add the catch-all invalid rule**``
```
1==1
```
Click the "Valid" word and change it to "Invalid", select a colour, and add a message if required.
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