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Model	Cat. #	Description	List Price	Quantity/Status
6424	2135.57	Ground Resistance Tester Model 6424 (Digital, 3-Point) NIST Calibration ($96.00 each)	$995.00	In stock at factory. Find a Distributor
6424 Kit-150ft	2135.58	Ground Resistance Tester Model 6424 Kit-150 ft (Digital, 3-Point) NIST Calibration ($105.00 each)	$1,579.00	Consult Factory for Availability
6424 Kit-300ft	2135.59	Ground Resistance Tester Model 6424 Kit-300 ft (Digital, 3-Point) NIST Calibration ($105.00 each)	$1,740.00	Consult Factory for Availability

Model	6424
Cat. #	2135.57
Description	Ground Resistance Tester Model 6424 (Digital, 3-Point)
List Price	$995.00
In stock at factory. Find a Distributor

Model	6424 Kit-150ft
Cat. #	2135.58
Description	Ground Resistance Tester Model 6424 Kit-150 ft (Digital, 3-Point)
List Price	$1,579.00
Consult Factory for Availability

Model	6424 Kit-300ft
Cat. #	2135.59
Description	Ground Resistance Tester Model 6424 Kit-300 ft (Digital, 3-Point)
List Price	$1,740.00
Consult Factory for Availability

Model 6424 - Cat. #2135.57: Includes carrying bag, (6) 1.2 V AA NiMH rechargeable battery (not installed), USB to wall charger, 5 V, 2 A, USB charger cable and user manual.

Model 6424 Kit (150 ft) - Cat. #2135.58: (Ground Resistance Tester Model 6424 and Test Kit For 3-Point Testing cat. 2135.35) Includes carrying bag, (2) 150 ft color-coded leads on spools (red/blue), (1) 30 ft lead (green), (2) 5 ft color-coded leads (red/blue), (2) 14.5 in T-shaped auxiliary ground electrodes, (6) 1.2 V AA NiMH rechargeable battery (not installed), (1) 100 ft AEMC^® Instruments tape measure and user manual.

Model 6424 Kit (300 ft) - Cat. #2135.59: (Ground Resistance Tester Model 6424 and Test Kit for 3-Point Testing cat. #2135.36) Includes carrying bag, (2) 300 ft color-coded leads on spools (red/blue), (2) 100 ft color-coded leads (hand tied, green/black), (2) 5 ft color-coded leads (red/blue), (4) 14.5 in T-shaped auxiliary ground electrodes, (6) 1.2 V AA NiMH rechargeable battery , (1) 100 ft AEMC^® Instruments tape measure, 5 V, 2 A, USB charger cable, USB to wall charger, and user manual.

ELECTRICAL
Voltage
Range	(0.1 to 600) VAC/DC
Resolution	0.1 V
Accuracy	± (1 % R + 1 ct)
Current
Range	(0.5 to 60.00) AAC (requires optional MN72 probe)
Ground Resistance (2P Mode)
Measurement Range	(0.05 to 99.99) Ω	(80.0 to 999.9) Ω	(0.800-9.999) kΩ	(8.00-50.00) kΩ
Resolution	0.01 Ω	0.1 Ω	1 Ω	0 Ω
Intrinsic Uncertainty	± (2 %R + 10 ct)	± (2 %R + 2 ct)	±(2 %R + 1 ct)	±(2 %R + 1 ct)
Ground Resistance (3P Mode)
Measurement Range	(0.50 to 99.99) Ω	(80.00 to 999.99) Ω	(0.800 to 9.999) kΩ	(8.00 to 50.000) kΩ
Resolution	0.01 Ω	0.1 Ω	1 Ω	10 Ω
Intrinsic Uncertainty	± (1 % R + 10 ct)	± (1 % R + 2 ct)	± (1 % R + 1 ct)
Measurement Frequency	128 Hz or 256 Hz (automatically selected)
No-load Voltage	±10 V peak
Maximum Test Current	20 mA
Measurement Mode	One shot or continuous
Data Storage	Stores the (52, 62 and 72) % 3P resistance measurements
Calculation	Calculates average and % deviation of the three saved readings
GENERAL
Display	Backlit LCD
Measurement Mode	V, I, 2P (Ω), 3P (Ω)
Power Supply	(6) 1.2 V AA NIMH rechargeable,charging time approx. 6 h
Battery Life	>1,500 x 3P earth measurements at 100 Ω
Dimensions	(8.78 x 4.96 x 2.75) in (223 x 126 x 70) mm
SAFETY
Safety Ratings	EMC: IEC 61326-1; IEC 61010-2-030 / 600 V CAT IV

Comparison Charts

Ground Tester Comparison Chart - English

Tabla de Selección de Medidores de Tierra - Español

Workbooks

Understanding Ground Resistance - English

Understanding Ground Resistance - Español

Technical Bulletins

Watts Current Issue 08

Applications - Graphic Illustrations

Residential & Commercial Applications

Videos

Choosing the Right Ground Resistance Tester

Understanding Ground Resistance Testing

Reel Accessories to Save You Time

Model	Cat. #	Description	List Price
	2135.35	Ground Resistance Test Kit for 3-Point Testing - 150ft Test Kit for 3-Point Testing, Kit (Carrying Bag, [2] 150 ft Color-coded Leads on Spools (Red/Blue), [1] 30 ft Lead (Green), [2] 5 ft Color-coded Leads (Red/Blue), [2] 14.5" T-shaped Auxiliary Ground Electrodes, [1] Set of 5, Spaded Lugs and [1] 100 ft AEMC® Tape Measure)	$595.00
	2135.36	Ground Resistance Test Kit for 4-Point Testing - 300ft Test Kit for 4-Point Testing, Kit (Carrying Bag, [2] 300 ft Color-coded Leads on Spools (Red/Blue), [2] 100 ft Color-coded Leads (hand tied-Green/Black), [2] 5 ft Color-coded Leads (Red/Blue), [4] 14.5" T-shaped Auxiliary Ground Electrodes, [1] Set of 5, Spaded Lugs and [1] 100 ft AEMC® Tape Measure)	$760.00
	2135.93	Cable - Replacement USB charger cable w/ wall plug for model 6424	$39.50
MN72	2153.06	AC Current Probe Model MN72	$320.00
	5000.04	Red replacement wire (150 ft) on reel for ground resistance tester kits (models 3620, 3640, 4620, 4630, 6422 & 6424)	$154.00
	5000.07	Blue replacement wire (150 ft) on reel for ground resistance tester kits (models 3620, 3640, 4620, 4630, 6422 & 6424)	$154.00
	5000.18	Empty replacement reel for ground kits (holds up to 500ft of wire) Outer Ø: 7.5" - Inner Ø: 3.75" - Width: 4.56"	$23.25
	5000.92	5000.92 - Calibration Checker for Ground Tester Models 6422 & 6424	$88.00

Model
Cat. #	2135.35
Description	Ground Resistance Test Kit for 3-Point Testing - 150ft Test Kit for 3-Point Testing, Kit (Carrying Bag, [2] 150 ft Color-coded Leads on Spools (Red/Blue), [1] 30 ft Lead (Green), [2] 5 ft Color-coded Leads (Red/Blue), [2] 14.5" T-shaped Auxiliary Ground Electrodes, [1] Set of 5, Spaded Lugs and [1] 100 ft AEMC® Tape Measure)
List Price	$595.00

Model
Cat. #	2135.36
Description	Ground Resistance Test Kit for 4-Point Testing - 300ft Test Kit for 4-Point Testing, Kit (Carrying Bag, [2] 300 ft Color-coded Leads on Spools (Red/Blue), [2] 100 ft Color-coded Leads (hand tied-Green/Black), [2] 5 ft Color-coded Leads (Red/Blue), [4] 14.5" T-shaped Auxiliary Ground Electrodes, [1] Set of 5, Spaded Lugs and [1] 100 ft AEMC® Tape Measure)
List Price	$760.00

Model
Cat. #	2135.93
Description	Cable - Replacement USB charger cable w/ wall plug for model 6424
List Price	$39.50

Model	MN72
Cat. #	2153.06
Description	AC Current Probe Model MN72
List Price	$320.00

Model
Cat. #	5000.04
Description	Red replacement wire (150 ft) on reel for ground resistance tester kits (models 3620, 3640, 4620, 4630, 6422 & 6424)
List Price	$154.00

Model
Cat. #	5000.07
Description	Blue replacement wire (150 ft) on reel for ground resistance tester kits (models 3620, 3640, 4620, 4630, 6422 & 6424)
List Price	$154.00

Model
Cat. #	5000.18
Description	Empty replacement reel for ground kits (holds up to 500ft of wire) Outer Ø: 7.5" - Inner Ø: 3.75" - Width: 4.56"
List Price	$23.25

Model
Cat. #	5000.92
Description	5000.92 - Calibration Checker for Ground Tester Models 6422 & 6424
List Price	$88.00

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Ground Resistance Tester Model 6424 (Digital, 3-Point)

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