The Megger BAKER DX R PD 4 is the most advanced and versatile insulation tester on the market. It offers a wide range of features and capabilities that set it apart from the competition, including: A high output voltage of 5 kV, which allows it to test even the most heavily insulated equipment A wide range of test currents, from 1 nA to 20 mA, which allows it to test a variety of insulation types A built-in polarization index (PI) and dielectric absorption ratio (DAR) function, which allows it to assess the condition of insulation over time A large, backlit LCD display that makes it easy to read test results, even in low-light conditions* A rugged, weatherproof case that makes it ideal for use in harsh environments