The price and stock checker connects online to the Classof SQL ERP system. It can be used in two ways: either using the phone's camera to scan the products, or using the alphanumeric search after two text sequences from the name of the products or their code. After identifying the product in the ERP system, the current selling price is displayed (the price can be set from category 1 to 6), as well as the stocks for the management to which the user has access. The online connection to the Classof SQL ERP database is done either via WIFI or via mobile data (mandatory public numeric IP, not DNS in the case of online servers). For VPN-type networks, first the device must be connected to this type of network with all rights configured.