Amprobe GP-2A Ground Resistance Resistivity Tester

(1 customer review)

  • Measures earth ground resistance – 3 point (fall of potential) or 2 point tests
  • Automatically calculates resistivity – 4 point test
  • Automatic voltage measurement prevents false measurements
  • Automatically applies three testing frequencies for the most accurate readings
  • Test leads, auxiliary electrodes and software are included for complete instrument
  • Autoranging
  • 999 internal memory locations to store measurements
  • RS-232 download to a personal computer
SKU: 4129187 Category:


Poor grounding is dangerous and contributes to unnecessary downtime and increases the risk of equipment failure. The Amprobe GP-2A Earth Ground Resistance Tester provides accurate and reliable measurements for ground resistance and soil resistivity to assure the safety and performance of an electrical system. The GP-2A is complete with PC software that allows the user to download critical recorded measurements and to create professional reports for customers.

Additional information



FEATURE Range Accuracy
Ground resistance
(2 and 3-wire method)
0.01 Ω – 19.99 Ω / 199.9 Ω / 1999 Ω
19.99 kΩ / 49.9 kΩ
±(2.5% rdg + 2 LSD)
Ground Resistivity (4-wire) 0.06 Ωm – 19.99 Ωm / 199.9 Ωm / 1999 Ωm
19.99 kΩm / 199.9 kΩm / 314 kΩm
 ±(2.5% rdg + 2 LSD)
Voltage Measurement 0 V – 460V ±(2.5% rdg + 2 LSD)
Ranging Auto
Noise Voltage Detection Yes
Display Backlight Yes
Data Storage up to 999 readings
PC Connection Yes
Auto Power Off Yes
Low Battery Indication Yes
Resistance Measurement Open circuit voltage ≤ 25 Vrms
Test current ≤12 mA
Measuring Frequency 77.5 Hz ± 1 Hz
Measuring Range 3- and 2-wire earth resistance measurement: 0.08 Ω – 49.9 kΩ
Earth resistivity (4-wire): 0.50 Ωm – 314 kΩm
Maximum Deviations Influence factor Deviation influence
E1 Position 0.3%
E2 Supply voltage 0.1%
E3 Temperature 0.1%
E4 Serial interference voltage 0.4%
E5 Probe and auxiliary probe resistance 0.9%
Electromagnetic Compatibility Complies with IEC/EN 61326
Measuring Function Earth ground resistance – 3 point (fall of potential) or 2 point tests
Earth resistivity – 4 point test
Noise voltage
Display LCD with backlight, visible area 73 x 65 mm
Operating Altitude ≤ 2000 meters
Operating Temperature 0 °C to +40 °C (32 °F to 104 °F)
Storage Temperature -10 °C to +60 °C (14 °F to 140 °F)
(without condensation)
Power Supply Six 1.5V batteries AA R6 MN1500 or six 1.2V AA R6 Ni-MH 2100mA rechargeable batteries
Battery Life Approximately 500 tests
Auto Power Off 3 minutes
Overvoltage Category CAT III 240V safety rated (phase to earth), maximum 415V between inputs
Safety IEC/EN 61010-1, CAT III 240 V, pollution degree 2
IEC/EN 61010-031 for test lead accessories
IEC/EN 61557-1/-5
EMC IEC/EN 61326
Size (H x W x L) Approximately 235 x 165 x 75 mm (9.25 x 6.50 x 2.95 in)
Weight Approximately 1 kg (2.2 lb) with batteries installed
Included Accessories Four ground stakes, test lead set, alligator clip set, USB cable, USB driver software, carrying case and users manual
 Warranty One year


What’s Included

  • GP-2A
  • Batteries (installed)
  • Connection cables
  • 4 ground stakes
  • PC software
  • USB cable
  • Carrying case


Datasheet »
Product Manual »

1 review for Amprobe GP-2A Ground Resistance Resistivity Tester

  1. SteveB

    Great build quality, great functionality

    I received an Amprobe GP-2A as a warranty replacement for a previous model that arrived without the accessory bag containing all of the connection cables, the comm cable, and stakes. Amrpobe’s Customer Service handled the issue like pros and sent me the replacement unit straight away.

    Using the GP-2A was very intuitive and provided us with highly accurate results for both ground array resistance and soil resistivity. Both of which were very important to us in the design and installation of a fuel handling & storage facility that required lightning protection, a low resistance ground grid, and cathodic protection for buried pipelines. The ability to export the results was icing on the cake.

    Well done, Amprobe!

    ✔ Yes, I recommend this product.

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