The Resistivity Meter Test Box is a convenient way to verify the proper operation of soil resistivity meters in the field by checking the meter function without being connected to the extension leads. Includes: Test Box, Test Leads and a Certificate of Conformance. The Soil Resistivity Meter Test Box is tool to help the field technician diagnose problems encountered when performing a soil resistivity survey by confirming the soil resistivity meter is performing properly. By ruling out the meter as a source of an error, the technician can then troubleshoot the external connections or associated cables to determine the cause. Works with both the H-4385D and H-4385 Resistivity Meters.