Keyboard Tester Pro is a professional hardware diagnostic application designed to verify keyboard and mouse functionality in real time. The software visually highlights every key press on a complete keyboard layout, enabling instant detection of non-working keys, double-typing (chatter), ghosting, rollover limits, and latency issues. The tool tracks hold duration, scan codes, modifier states, and mouse input during testing sessions. All tests execute locally on the machine without requiring internet connectivity. Reports and screenshots can be exported for documentation, warranty claims, or technical analysis.