The Extech 380320 Analog Insulation Tester features a big, easy-to-read analog display. It includes a live circuit warning that shows the actual AC voltage reading. It also has an automatic discharge circuit, a lock power on feature for longer test times, and insulation resistance of up to 400 MΩ. The kit includes heavy duty test leads, an alligator clip test lead, 6 AA batteries, a hanging rope, and a protective carrying box.