windpi.ps1

# Credit: Peter Hinchley via https://hinchley.net/articles/get-the-scaling-rate-of-a-display-using-powershell/
Add-Type @'
  using System; 
  using System.Runtime.InteropServices;
  using System.Drawing;

  public class DPI {  
    [DllImport("gdi32.dll")]
    static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

    public enum DeviceCap {
      VERTRES = 10,
      DESKTOPVERTRES = 117
    } 

    public static float scaling() {
      Graphics g = Graphics.FromHwnd(IntPtr.Zero);
      IntPtr desktop = g.GetHdc();
      int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES);
      int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES);

      return (float)PhysicalScreenHeight / (float)LogicalScreenHeight;
    }
  }
'@ -ReferencedAssemblies 'System.Drawing.dll'

[Math]::round([DPI]::scaling(), 2)