It is critical for facilities to have grounded electrical systems, so that in the event of a lightning strike or utility overvoltage, current will find a safe path to earth. To ensure a reliable connection to earth, the International Electrical Testing Association specifies ground electrode testing every three years.

Flukes Earth/Ground Clamp Meters allow the testing of the grounding components of equipment in hard-to-reach spaces, including areas that are indoors or fully paved and do not permit driving auxiliary test stakes.