Calibrating the monitor of an arcade machine is essential for delivering the best visual experience to players. The most common practices include adjusting brightness and contrast to ensure clarity, setting the correct color balance for accurate visuals, and fine-tuning the geometry to avoid distortion. For CRT monitors, degaussing is often necessary to remove magnetic interference. Additionally, testing the display with calibration patterns or in-game visuals helps verify optimal settings. Regular maintenance and recalibration ensure long-term performance and vibrant gameplay visuals.