You can check to see which product's quantities have dipped below their Reorder Level by navigating to Inventory > Low Inventory.
You can set the Reorder Level for your products by going to Inventory > Inventory Management
- Hover over actions> view next to a particular product
- In the details section (pictured below), you will see the Reorder Level field. If your Quantity on Hand field drops below the value set here, the item will appear on the Low Inventory page.