Monitor Tester is a portable, freeware application designed for testing a computer screen. Its a simple application, but effective. Monitor Tester tests the screen by allowing you to view a variety of patterns to make a screen fault obvious. It can also be used to help you calibrate working monitors.
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Download from Majorgeeks – 298 kB

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Great. I have some old monitors that I might want to try this on.
Cool stuff!