WooPOS is a high-end all-in-one WooCommerce integrated point of sale software runs on Windows 10. WooPOS will help you run every aspect of your retail business. From inventory management to data analytics, sales processing, and employee management, the Windows-based point of sale software will help you manage your single or multiple location retail stores. With WooCommerce POS Integration, you can manage your online web store quickly and effectively.
http://woopos.com/

This WooPOS Inventory Count app allows you to do inventory count with or without WooPOS.

Before you start using the app, you can create an SKU list file or upload SKU List from WooPOS.
https://support.woopos.com/knowledge-base/uploading-sku-list-inventory-count-scanner/
The SkuList.txt file is located in the root folder of the scanner internal storage. It’s a comma delimited CSV file which contains Sku, Description, Price. It looks like this:

SKU_87,Woo Album #2 QOH:104,$9.00
SKU_73,Premium Quality QOH:-22,$6.00,;08621611811;,1
SKU_53,Happy Ninja QOH:4 SnapshotQty:0,$200.00,;UPC1;UPC2;EAN3;

Once you have done scanning, the scan list file (ScanList.txt) will be automatically created in the root folder of the scanner internal storage. It’s a comma delimited CSV file which contains Sku(or barcode or UPC), Quantity. It looks like this:

SKU_70-RED-SMALL,1
SKU_37,2
08621611811,3

To start inventory count with WooPOS, please check the general guide here:
https://support.woopos.com/knowledge-base/inventory-count-guide/

If you use WooCommerce without WooPOS, you can download and install WooCommerce Inventory Count plugin directly from WordPress website:
https://wordpress.org/plugins/woo-inventory-count/