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Amprobe GP-2A Ground Resistance & Resistivity Tester




$5,746.11 including GST
Please contact us for lead time

own it from $10 a week with Group 2 Copy Created with Sketch.

Shipping & Delivery

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.

  • 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
  • Users Manual
  • Batteries (installed)
  • Connection Cables
  • 4 Ground Stakes
  • PC software
  • USB Cable
  • Carrying Case
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


A delivery and handling charge applies to all orders with the exception of back-ordered items.

Unless otherwise required by Buyer, Seller will make transport arrangements as follows:

For deliveries within the metropolitan areas of mainland State capital cities a standard freight charge may be added to invoice; goods

For delivery outside those areas, seller will select the transport to be used and prepay freight for Buyer. Seller will then bill Buyer for freight at Seller's discretion.

Should the Buyer request goods be sent to a Post Office box the Buyer acknowledges this method is the only available and therefore the Seller is not liable for undelivered goods.

Free shipping on orders over $175 excluding GST (valid for 1 delivery per order and excludes NT, WA & TAS). If only part of the order is in stock, the customer has the option of paying for a second delivery if they require a partial shipment prior to all goods becoming available. Mektronics Australia reserves the right to charge additional freight in the event of hazardous, bulky or heavy items ordered.


All quoted delivery or consignment dates are estimates only, given without engagement.

Delay in consignment of any part of an order shall not relieve Buyer of its obligation to accept and pay for the remainder of the order.

Except as provided in paragraph 1.2 of Terms & Conditions, seller will not be liable to pay damages or compensation for any injury or loss sustained by Buyer

a) in the event of a delay in consignment or delivery of goods: or

b) in the event of non delivery.

Goods offered ex-stock by Seller are subject to prior sale.

In the event of any happening beyond Seller's reasonable control in consequence of which Seller cannot effect consignment by the time or times quoted or specified, Seller shall be entitled to consign part only of an order, suspend consignment or extend the time for consignment, for the period during which such cause of delay operates, or may cancel the order, and in the event of such suspension, extension or cancellation, Seller shall not be liable for damages.