Easily perform Fall of Potential Testing. Simple one button operation. Each Instrument includes everything you need to test. 3 Wires, one for your ground rod (green) and two other wires to run out in order to set up your ground field. (yellow and red) These wires are already at the correct length for the 62% rule. Just stretch them out and you are ready to go. Two ground spikes for your wires. Included with the Megger Meter is a power point presentation designed to help you better understand the principals behind setting up a ground field.