At Vertex Video, we've manufactured high-quality video test charts and custom patterns since 1978. As industry leaders, we introduced our copyrighted ACCU-CHART™ HDTV Test Chart in 1989. Each hand-crafted ACCU-CHART™ is backed by close to four decades of proven experience, earning a solid reputation as the most ACCURATE, DURABLE, and AFFORDABLE video test charts available which video professionals, students and amateur video enthusiasts - all know