The Biddle Megger 21805-1 Turn-Crank Insulation Tester is a reliable and durable tool designed for testing the insulation resistance of electrical systems. With a sturdy leather case for easy portability and storage, this Megger product ensures accurate measurements with its turn-crank design. The included leads make it convenient to test various components in electrical setups, making it a valuable asset for professionals in the field of electrical testing and inspection. The Megger brand is known for producing high-quality insulation testers, making this product a trusted choice for those in need of precision testing equipment.