Acer K2 Essential - 19.5" Monitor HD+ 1600x900 75Hz TN 6ms 200Nit HDMI VGA. Get exceptional value with this professionally refurbished Acer K2 Essential monitor! From service-oriented technologies to the Internet of Things to gaming and virtual reality, Acer’s 7,000+ employees are dedicated to the research, design, marketing, sale, and support of products and solutions that break barriers between people and technology.