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I am using powershell 7 and i used following code:

Add-Type -AssemblyName System.Windows.Forms 
$rh=[int]((Get-CimInstance -ClassName CIM_Display).ScreenHeight | Format-Table -HideTableHeaders | Out-String)
$vh=[int][System.Windows.Forms.SystemInformation]::VirtualScreen.Height
$screen_scale_factor=$rh/$vh