HIOKI Earth Resistance Testers – Reliable Grounding for Safe Installations
Why is earth resistance testing important?
HIOKI FT6041 - Multi-function Earth Tester for 4-Pole Measurement and Soil Resistivity
HIOKI FT6041-91 - Earth Tester Set with Selective and Stakeless Testing
HIOKI FT6031-50 - Earth Tester for 2-Pole and 3-Pole Measurement
HIOKI FT6031-90 - Earth Tester with Bluetooth for 2-Pole and 3-Pole Measurement
HIOKI FT6380-50 - Earth Ground Clamp for Multi Grounded Systems
HIOKI FT6380-90 - Ground Resistance Clamp with Bluetooth for Multi Grounded Systems
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HIOKI FT9847 - Signal Induction Clamp for the FT6041 Earth Tester
HIOKI CT9848 - Signal Detection Clamp for the FT6041 Earth Tester
HIOKI L9845-31 - Test Lead Cable Reel, yellow, 25 m
HIOKI L9845-33 - Test Lead Cable Reel, blue, 25 m
HIOKI L9845-52 - Test Lead Cable Reel, red, 50 m
Product Comparison: Select your HIOKI Earth Tester
HIOKI offers a complete range from traditional clamp-on testers for quick checks in residential and small commercial sites to advanced digital meters with true voltage measurement and Bluetooth connectivity for use in demanding industrial environments.
| Feature | FT6041 Earth Resistance Tester | FT6031-50 Earth Resistance Tester | FT6380-50 Clamp-on Earth Tester | FT3151 Analog Earth Tester |
|---|---|---|---|---|
| Method | Digital tester, 4-, 3- or 2-pole testing with earthing rods, clamp-on measurement | Digital tester, 2- and 3-pole with earthing rods | Clamp-on earth tester for multi-grounded systems | Analog tester with manual operation, 3- or 2-pole testing |
| Earth resistance range | 3 – 300 kΩ | 0 – 2000 Ω | 0.2 – 1600 Ω, 10 ranges | 10 – 1000 Ω |
| Safety category | CAT IV 100 V / CAT III 150 V / CAT II 300 V | CAT IV 100 V / CAT III 150 V / CAT II 300 V | CAT IV 600 V, True RMS | CAT II 300 V |
| Power supply | Batteries | Batteries | Batteries | Batteries |
| Highlights | High accuracy, extended range, IP67 protected | Lightweight, easy stake setup, IP67 protected | No rods needed, fast clamp measurement | Rugged, simple, ideal for basic checks |
Advanced Earth Testing for 4-Pole and Soil Resistivity Measurement
.jpg "HIOKI 9050 - Earth nets for measurements on concrete and hard surfaces")
Compact Earth Testing for 2-Pole and 3-Pole Checks
The HIOKI Earth Testers FT6031-50 and FT6031-90 are designed for maintenance, periodic inspection, and service work on grounding systems, including existing earth electrodes in buildings and electrical installations. They support standards-compliant earth resistance measurement in accordance with IEC 60364 and EN 61557-5, combining more precise 3-pole measurement with a simplified 2-pole method when a full setup with auxiliary earth spikes is not possible.
Both instruments are rated IP67 for dust and water protection, making them suitable for outdoor use. The FT6031-90 additionally includes the Z3210 Bluetooth Adapter for wireless data transfer and measurement documentation.
Clamp-On Ground Testing for Multi-Earthed System
The HIOKI FT6380-50 and FT6380-90 are clamp-on earth testers for grounding checks in systems with multiple parallel earth paths. They measure ground resistance directly on the connected earth conductor without disconnecting it, making them ideal for fast on-site checks on transmission towers, tanks, industrial plants, lightning protection systems, and PV installations.
Both models also support leakage current and True RMS AC current measurement up to 60 A, with a conductor diameter up to 32 mm and CAT IV 600 V safety rating. The FT6380-90 adds Bluetooth for GENNECT Cross, mobile documentation, and HID data transfer.
Earth testing on concrete? No hammer required.
For earth measurements, auxiliary earth spikes are usually driven into the ground. But what if the surface is asphalt or concrete? Can earth nets do the trick? Kai Scharrmann went on a Saturday field trip to find out because seeing is believing - and the results were surprising. Follow along to find out what a school weaving frame and silkworms have to do with it
Made in Japan – Built for Lasting Precision
All HIOKI earth testers are designed in Japan and manufactured at our own R&D center and factories, ensuring the highest standards of precision, reliability, and lasting accuracy trusted by technicians worldwide.