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Electrical Safety & HV Test

Earth Resistance & Grounding Test

Complete Grounding Verification from Handheld to Substation-Scale Testing

Earth resistance and grounding test instruments verify that electrical installations, substations, and lightning protection systems maintain safe, effective grounding — from handheld clamp meters for routine checks through to specialized large grounding grid testers for substation commissioning.

This range covers clamp-on and multi-wire earth resistance testers, soil resistivity measurement, continuous online earth monitoring systems, large grounding grid testers for power infrastructure, and lightning protection component testers for surge arresters and TVS devices.

MEWOI3300 Earth Resistance & Grounding Tester
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Clamp-On Earth Resistance Testers — Multi-Method & High-Range
Clamp-On Earth Resistance Testers — Multi-Method & High-Range
No ground stake needed — clamps around the earth conductor for fast, non-invasive resistance measurement.
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ModelKey Specification 
MEWOI3300Clamp, 2-wire, 3-wire, 4-wire methodsEnquire
MEWOI32000.01Ω–1500ΩEnquire
MEWOI3000D0.01Ω–1000ΩEnquire
MEWOI3000D+0.01Ω–1200ΩEnquire
Clamp-On Earth Resistance Testers — Standard Range
Clamp-On Earth Resistance Testers — Standard Range
Standard-range clamp testers for routine grounding system verification.
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ModelKey Specification 
MEWOI3100D+0.01Ω–1200ΩEnquire
MEWOI3100B+0.01Ω–200ΩEnquire
MEWOI3100+0.01Ω–1200ΩEnquire
MEWOI3000C+Explosion-proof typeEnquire
Clamp-On Earth Resistance Testers — Entry-Level
Clamp-On Earth Resistance Testers — Entry-Level
Entry-level clamp testers for basic grounding checks and field service work.
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ModelKey Specification 
MEWOI3000B+0.01Ω–200ΩEnquire
MEWOI3000+0.01Ω–1200ΩEnquire
MEWOI30000.01Ω–1000ΩEnquire
Earth Resistance / Soil Resistivity Testers — Multi-Method
Earth Resistance / Soil Resistivity Testers — Multi-Method
Stake-driven testers supporting multiple measurement methods (Wenner, 2/3/4-wire) for grounding and soil resistivity surveys.
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ModelKey Specification 
MEWOI4300DDual-clamp, 2-wire, 3-wire, 4-wireEnquire
MEWOI4200DDual-clamp, 4-wire WennerEnquire
MEWOI4000C4-terminal (Wenner), 2-wire, 3-wireEnquire
MEWOI4000+2-wire, 3-wireEnquire
Earth Resistance / Soil Resistivity Testers — Standard & High-Accuracy
Earth Resistance / Soil Resistivity Testers — Standard & High-Accuracy
Standard 3-terminal and high-accuracy testers for substation and transmission tower grounding.
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ModelKey Specification 
MEWOI4105A3-terminal methodEnquire
MEWOI4000DHigh accuracyEnquire
MEWOI4000A+Auto-rangeEnquire
MEWOI4250Power transmission tower and substation groundingEnquire
Earth Resistance / Soil Resistivity Testers — Compact
Earth Resistance / Soil Resistivity Testers — Compact
Compact stake-driven testers for general-purpose grounding checks.
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ModelKey Specification 
MEWOI42000.01Ω–30kΩEnquire
MEWOI40002-wire, 3-wireEnquire
Online & Specialty Earth Testers
Online & Specialty Earth Testers
Measures grounding integrity without disconnecting the system, plus overhead line fault location.
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ModelKey Specification 
MEWOI2400Overhead power line ground fault detection and locationView
MEWOI Contact Online Earth TesterContact-type online methodView
MEWOI Open Loop Online Earth Resistance TesterOpen-loop injection methodView
MEWOI Close Loop Online Earth Resistance TesterClose-loop clamp methodView
Grounding Grid & Surface Resistance
Grounding Grid & Surface Resistance
Large-scale grounding grid resistance measurement and surface/volume resistivity testing.
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ModelKey Specification 
MEWOI Surface Resistance MeterSurface resistance and volume resistivityView
MEWOI Large Grounding Grid TesterLarge power substation grounding gridsView
Lightning & Surge Protection Testers
Lightning & Surge Protection Testers
Verifies surge/TVS protection components and monitors insulation resistance on live systems.
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ModelKey Specification 
MEWOI4850Reverse breakdown voltage and TVS parametersView
MEWOI4800BAdvanced version of MEWOI4800AEnquire
MEWOI4800AInitial action voltage, residual voltage, leakage currentEnquire
MEWOI4580Online insulation resistance monitorView
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