Earth resistance testers compared

Technical data of the 8 units of this type offered by Amperis, row by row. Tick «Compare» on two or three to see them side by side, copy the link or print the comparison.

Earth resistance testers compared

	AMRU-10: earth resistance tester	Telurometer AMRU 120	Telurometer AMRU-200	Telurometer AMRU-200 GPS	AMRU-12 AMRU-12 No product page on this site	AMRU-120HD AMRU-120HD No product page on this site	AMRU-21 AMRU-21 No product page on this site	AMRU-30 AMRU-30 No product page on this site
Measurement methods	Technical 3-pole per EN 61557-5; 2-pole	Not stated on the product page	Earth impedance (impulse method): 0.0 – 200 Ω, 4/10 μs or 10/350 μs impulse	2, 3 and 4-pole; pulse; double clamp; resistivity (Wenner)	3-pole and 4-wire acc. to EN 61557-5; 2-pole; Wenner and Schlumberger resistivity	3-pole and 4-wire acc. to EN 61557-5; 3-pole with clamp; two-clamp; Wenner resistivity	3-pole acc. to EN 61557-5; 2-pole	3-pole and 4-wire acc. to EN 61557-5; 3-pole with clamp; two-clamp; 2-pole; Wenner resistivity
Measuring range	Earth resistance range: 0.53 – 9999 Ω (UN = 50 V); display from 0.01 Ω Accuracy: ±(3 % m.v. + 3 digits) to 199.9 Ω; ±5 % / ±8 % above Auxiliary electrodes: RH and RS up to 19.9 kΩ; ±(5 % m.v. + 8 digits)	0.00 Ω – 19.9 kΩ; to IEC 61557-5, from 0.30 Ω	0.00 Ω – 19.9 kΩ; to IEC 61557-5, from 0.10 Ω	0.00 Ω to 19.9 kΩ, according to IEC 61557-5	0.53 – 9999 Ω acc. to EN 61557-5; display from 0.01 Ω Accuracy: from ±(3% m.v. + 3 digits) Auxiliary electrodes RH and RS: 0 – 19.9 kΩ Selectable test voltage: 25 or 50 V; interference voltage: 0 – 100 V	0.30 Ω – 19.9 kΩ acc. to EN 61557-5; display from 0.01 Ω Accuracy: from ±(2% m.v. + 2 digits) Test current >200 mA; selectable test voltage: 25 or 50 V Auxiliary electrodes RS and RH: 0 – 19.9 kΩ	0.50 Ω – 1.99 kΩ acc. to EN 61557-5; display from 0.01 Ω Accuracy: ±(2% m.v. + 3 digits) Auxiliary electrodes RS and RH: 0 – 50.0 kΩ Selectable test voltage: 25 or 50 V; interference voltage: 0 – 100 V	0.53 – 9999 Ω acc. to EN 61557-5; display from 0.01 Ω Accuracy: from ±(3% m.v. + 3 digits) Auxiliary electrodes RS and RH: 0 – 19.9 kΩ Selectable test voltage: 25 or 50 V; 50 and 60 Hz networks
Clamp measurement	Not stated on the product page	Resistance with clamp (3-wire + clamp): 0.00 – 1999 Ω; to IEC 61557-5, from 0.44 Ω Resistance with double clamp: 0.00 – 149.9 Ω	Resistance with clamp (3-wire + clamp): 0.00 – 1999 Ω; to IEC 61557-5, from 0.12 Ω Resistance with double clamp: 0.00 – 149.9 Ω Leakage current with clamp: 0.1 mA – 300 A	0.1 mA to 300 A	Not stated in the documentation	3-pole + clamp: 0.44 – 1999 Ω acc. to EN 61557-5 Two-clamp: 0.00 – 149.9 Ω Clamp calibration	Not stated in the documentation	3-pole + clamp: 0.00 – 9999 Ω Two-clamp: 0.00 – 99.9 Ω Leakage current: 0.0 mA – 5.00 A
Soil resistivity	Not stated on the product page	0.00 Ωm – 999 kΩm (Wenner method)	0.00 Ωm – 999 kΩm (Wenner method)	0.1 Ω·m to 999 kΩ·m	0.0 Ωm – 999 kΩm (Wenner and Schlumberger); distances in m or ft	0.0 Ωm – 999 kΩm (Wenner); result in Ωm or Ωft	Not stated in the documentation	0.00 Ωm – 999 kΩm (Wenner); distances in m or ft AMRU-30 Pro version with resistivity accessory set
Continuity	Not stated on the product page	0.00 Ω – 19.9 kΩ, current ≥200 mA	0.00 Ω – 19.9 kΩ; to IEC 61557-5, from 0.045 Ω	0.24 Ω to 19.9 kΩ, according to IEC 61557-5, current >200 mA	Not stated in the documentation	0.24 Ω – 19.9 kΩ acc. to EN 61557-4, current ≥200 mA; lead auto-zero	0.13 – 199 Ω acc. to EN 61557-4, current ≥200 mA; lead auto-zero	0.13 – 1999 Ω acc. to EN 61557-4, current ≥200 mA; lead auto-zero
Memory and communications	Not stated on the product page	990 measurements (10 banks of 99 cells)	990 measurements (10 banks of 99 cells)	Memory: 990 measurements (10 banks of 99 cells) Positioning and clock: Built-in GPS and real-time clock (RTC)	990 results (10 banks of 99 cells); Bluetooth	990 results (10 banks of 99 cells); USB and Bluetooth; real-time clock	990 results (10 banks of 99 cells); USB	990 results; USB 2.0
Power supply	4 × AA alkaline batteries or NiMH accumulators	4.8 V Ni-MH battery, 3 Ah (4.2 Ah optional)	Not stated on the product page	Ni-MH 4.8 V 4.2 Ah battery; more than 300 measurements	1.5 V AA (LR06) alkaline batteries	4.8 V 4.2 Ah NiMH battery; charging via mains adapter or 12 V car socket	1.5 V LR14 (C) alkaline batteries	Built-in rechargeable battery; charging from mains adapter, power bank or 12 V car socket
Safety and protection	CAT IV 150 V; double insulation; IP67	Measurement category: CAT III 600 V, to EN 61010-1 Protection rating: IP54	Measurement category: CAT III 600 V, to EN 61010-1 Protection rating: IP54	CAT III 600 V; IP54	CAT III 300 V; IP65; double insulation	CAT IV 300 V (≤2000 m); IP67 with case closed, IP54 open; double insulation	CAT III 600 V / CAT IV 300 V; IP54; double insulation	CAT III 300 V; IP65; double insulation
Operating conditions	-10 to +50 °C; humidity 20 – 90 %	Not stated on the product page	Not stated on the product page	-10 – +50 °C operating; -20 – +70 °C storage	-10 – +50 °C; humidity 20 – 90%	-10 – +50 °C; humidity 20 – 90%	-10 – +55 °C; humidity 20 – 90%	-10 – +50 °C; humidity 20 – 90%
Dimensions and weight	221 × 102 × 62 mm; approx. 660 g with batteries	Not stated on the product page	Not stated on the product page	Not stated on the product page	221 × 102 × 62 mm; 710 g	390 × 310 × 180 mm; approx. 4 kg	288 × 223 × 75 mm; approx. 1.4 kg	200 × 150 × 73 mm; approx. 1.14 kg
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