The ServiceNow Agent mobile app allows the user to conduct asset audits by scanning asset barcodes or QR codes1.
The user can perform audits offline when they are in areas without connectivity1.
The app automatically compares the scanned assets against the expected assets based on the inventory records to identify discrepancies1.
The user can also view the audit results and generate reports from the app2. References:
Audit your inventory - Product Documentation: San Diego - ServiceNow
Hardware Asset Inventory Management - ServiceNow
Hardware Asset Management - ServiceNow

The Overview view is a dashboard that displays metrics and charts related to the hardware assets in your organization.
The Overview view shows the following information:
The total number of hardware assets, their status, and their lifecycle stage.
The number of assets that are due for refresh, retired, or disposed in the current year, quarter, or month.
The refresh rate and the refresh cost of the hardware assets.
The asset age distribution and the asset model distribution.
The asset compliance status and the asset certification status.
To access the Overview view, you need to have the sn_ham.user role or the sn_ham.admin role.
To access the Overview view, navigate to Hardware Asset Management > Overview. Reference:
Overview
Hardware Asset Management roles

During an inventory audit, if you accidentally scan the same asset twice, the Hardware Asset Management (HAM) application will automatically remove the duplicate records and only import the unique scans. This is because the HAM application uses the asset tag or the serial number as a coalesce field, which prevents duplicate records from being created or updated in the hardware asset table. Therefore, you do not need to worry about scanning the same asset twice, as the HAM application will handle the duplicates for you. Reference:
Audit your inventory, which provides a step-by-step guide on how to perform scheduled or blind audits of asset stockrooms and other locations using the Agent mobile app and the Now Platform.
Hardware Asset States, which describes the different states and substates of hardware assets and how they are used to track the asset lifecycle.
Importing Hardware Assets into ServiceNow, which provides a step-by-step guide on how to import hardware assets into ServiceNow using an excel spreadsheet, an import set table, and a transform map.

The Hardware Asset dashboard is a collection of data visualizations that show key metrics on your hardware and consumable models and assets for the entire asset life cycle1.
The tabs in the Hardware Asset dashboard are updated in real time, meaning that they reflect the latest data from the Hardware Asset Management application2.
The tabs in the Hardware Asset dashboard are not based on scheduled jobs, hourly intervals, or 15-minute intervals, as these options would not provide the most accurate and up-to-date information on your hardware assets. Reference: 1: Hardware Asset dashboard - Product Documentation: San Diego - ServiceNow 2: Hardware Asset Management overview - ServiceNow - Now Support