The Fluke 1625-2 GEO Earth Ground Tester can perform all four types of earth ground measurement:

• 3-and 4-pole Fall-of-Potential (using stakes)
• 4-pole soil resistivity testing (using stakes)
• Selective testing (using 1 clamp and stakes)
• Stakeless testing (using 2 clamps only)

The Fluke 1625-2 offer such as advanced features as:

• Automatic Frequency Control (AFC) - identifies existing interference and chooses a measurement frequency to minimize its effect, providing more accurate earth ground value.
• R* measurement - calculates earth ground impedance at 55 Hz to more accurately reflect the earth ground resistance that a fault-to earth ground would see.
• Adjustable limits - for quicker testing