The inventory page is the best way to list all the products available in stock physically in the warehouse.

When you open the page, you need to filter to start listing the products (by product, location in the warehouse, name etc).

On the inventory page, you can use the "Scan" button in the top corner to either scan the barcode of a product, or the barcode of a warehouse location. Either way, you will be redirect to the stock page of the matching product.