Versatile signal generator for testing display devices. This portable VGA/SVGA/XGA signal generator supports four standard resolutions (640x480, 800x600, 1024x768, 1280x1024) at 60 Hz. It is suitable for HDTVs, LCD monitors, CRT color monitors, and projectors, helping electronics technicians test, adjust, and verify displays efficiently. Key benefits - Diagnose display issues quickly: Determine whether the problem is in the monitor or the host, enabling faster repair decisions. Useful when refurbishing or recycling monitors with defects by providing reliable signal testing. - 10 test patterns for comprehensive evaluation: Square, Bar, Red, Green, Blue, White, Gray, Black, Flash, Table to assess color accuracy, pixel alignment, and overall display performance. - Compact and portable design: 26mm x 52mm x 90mm, white ABS. Fits easily in a toolkit. - Flexible power options: One 9V battery (not included) or external AC adapter (7.5–9.0V). Use scenarios - In a repair workshop to isolate whether a display issue comes from the monitor or the host during troubleshooting. - In refurbishment or recycling lines to quickly screen defective units with reliable signal tests. - On site to verify compatibility and performance with projectors or various displays in classrooms, offices, or events.