The Megger BAKER AWA-IV 4KV is a portable, battery-operated insulation tester designed for testing electrical insulation in a variety of applications. It features a wide measurement range of 0.1 MΩ to 100 GΩ, and a test voltage of 4 kV. The AWA-IV also includes a number of advanced features, such as a built-in timer, a data logger, and a backlit display.