In the main screen of PERIFACT, go to main menu "PRODUCTS/SERVICES". There you will see a list of all the products and services that you want to include in your invoices on a regular basis. By the way, it is not mandatory to fill in and use this list. You may also complete your invoice manually.

A list of all available products and services will become visible.

You will immediately see in the overview the number of items in stock, any threshold at which warning can be given ( main menu PRODUCTS - SHOW OVERVIEW ) and the net value of the products.
Stock adjustment
The stock count automatically adjusts when creating a (credit) invoice.