HM-940 Soil Resistivity Kit consists of the Soil Resistivity Reel with four color-coded lead wires harnessed together, four Heavy Duty Soil Pins, and a Soil Box with leads for laboratory testing, housed in a sturdy, foam-lined plastic case. Lead wires plug into the reel hub and terminate with spring-loaded clamps at the opposite end. Soil Pins are 18x3/8in (457x9.5mm) stainless steel with T-handles. The plexiglas Soil Box for laboratory testing has removable potential pins of brass and current plates of stainless steel. Set of 4 Soil Box Lead wires are 24in (610mm) in length. A soil resistivity meter is not included in this kit; it is designed to be used with the HM-942 or HM-944 Soil Resistance Meters, purchased separately.