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Easy pole earth resistance measurement with super slim jaw

- Earth resistance measurement for multi-grounded systems
- Measure leak current with absolute certainty with highly sensitive 0.01 mA resolution (at 20.00 mA range)
- Measure load current up to 60.0 A range
- Clamp at the narrowest point
- Data transfer to Android™ phones using Bluetooth® wireless technology
- Real time data transfer, automatic report generation on Android™ phone. 

Basic Specification

Measurement Principle

The instrument has two cores for voltage injection and current measurement. From the defined voltage and measured current, the total circuit loop resistance is calculated
Note) For multi grounded systems only. In a multi-grounded system, the larger the number of grounding poles, the more accurate the measured value.

Earthing resistance

0.20 Ω (0.01 Ω resolution) to 1600 Ω (20 Ω resolution), 10 ranges, Zero suppression: Less than 0.02 Ω, Accuracy: ±1.5 % rdg. ±0.02 Ω

AC Current measurement

20.00 mA (0.01 mA resolution) to 60.0 A (0.1 A resolution), 5 ranges, Zero suppression: Less than 0.05 mA, Accuracy: ±2.0 % rdg. ±0.05 mA (30 Hz to 400 Hz, True RMS), Crest factor 5.0 and under (1.7 and under at 60 A range)

Max. allowable input

AC 100 A continuous, AC 200 A for 2 minutes or shorter (at 50/60 Hz, requires derating at frequency)

Max. rated voltage to earth


Memory function

2000 data

Alarm function

For resistance measurement and current measurement, Beeps when measured value is less than or greater than threshold

Other functions

Data hold, Back light, Filter, Auto power off


Digital LCD, max. 2000 dgt., Display refresh rate: 500 msec (approx. 2 times/second)

Waterproof and dustproof

IP40 (EN60529: 1991+A1: 2000) with clamp sensor closed

Communication interface

Model FT6381 only: Bluetooth® v2.1+EDR, Compatibility for Smartphone / Tablet, Displays measured values on the screen of an Android™ handset via Bluetooth, Applicable OS: Android™ 2.1 or later

Power supply

LR6 (AA) alkaline batteries ×2, Max. rated power: 450 mVA, Continuous use : 35 hr (in-house testing conditions)

Core jaw dia.

φ 32 mm (1.26 in)

Dimensions, mass

73 mm (2.87 in) W × 218 mm (8.58 in) H × 43 mm (1.69 in) D, 620 g (21.9 oz)

Supplied accessories

Carrying case ×1, Resistance check loop ×1, Strap ×1, LR06 alkaline battery ×2, Instruction manual ×1