the Tk scaling is not the windows scaling: you probably already read the vr's answer below. Is like Tk is assuming always a 96dpi settings while nowadays we are always running higher values.

Me too I dont use powershell but was the only way I found to retrieve physical monitor size and does not works in win7. As vr noted, I had a typo in the powershell cut&paste and if you see above now I have fixed it. I dont use power(s)hell also because its totally unuseful errors (tell me if the error emitted is the relevant one.. ;)

I love perl for its errors!

L*