Marmonix MEG725 Clamp Earth Resistance Tester

The Marmonix MEG725 clamp-on ground resistance tester measures loop resistance from 0.01 to 1000 Ω with a 55×32 mm jaw, automatic ranging and about 0.5-second readings, without auxiliary stakes or disconnecting the ground conductor on suitable bonded systems. It stores 99 groups, offers resistance alarms (1–199 Ω), and lists current measurement 0–30 A for C-type configurations only. Browse all Marmonix earth resistance testers, or compare the MEG825 clamp-on ground tester.

Marmonix MEG725 Clamp Ground Resistance Tester

The Marmonix MEG725 Clamp-On Ground Resistance Tester represents a major breakthrough in ground resistance measurement, offering unmatched capabilities compared to traditional methods. This device is widely used for ground resistance measurement in industries such as power, telecommunications, meteorology, oil, construction, and industrial electrical equipment.

One of the standout features of this device is its ability to measure the resistance of a grounding system with loops, without requiring the disconnection of grounding down leads or the use of auxiliary grounding electrodes. This makes the MEG725 safe, fast, and easy to use. Additionally, it can detect ground faults that traditional methods cannot measure.

The MEG725 measures the combined resistance of the grounding body and grounding leads, making it ideal for applications where traditional methods are ineffective. Furthermore, the Marmonix MEG725 is capable of measuring leakage current and neutral current in grounding systems, providing users with precise and comprehensive data.

With these features, the MEG725 is an essential tool for technicians and engineers in various industries who seek accuracy, speed, and ease in measuring ground resistance and related currents.

Marmonix MEG725 Specifications

General Specifications

Resistance Measurement Ranges and Accuracy

Current Measurement Ranges and Accuracy

Buying guide: Read our earth resistance tester buyer’s guide.

Questions about the MEG725 clamp-on ground resistance tester

Does the MEG725 need auxiliary earth stakes?

The MEG725 is a clamp-on meter for suitable looped, bonded or multi-grounded systems, so it does not need auxiliary stakes or a disconnected down-lead for those layouts. Its resistance range is 0.01–1000 Ω with 0.001 Ω maximum resolution.

Can every MEG725 measure current?

The MEG725 lists current measurement as 0–30 A for C-type configurations only, so do not assume every unit includes current. Resistance measurement, the 55×32 mm jaw, 99-group memory and resistance alarms apply across the series.

MEG725 or MEG825: which should I choose?

Choose the MEG725 for fast clamp-on resistance checks on bonded loops with the published 0.01–1000 Ω range and 55×32 mm jaw, and the MEG825 when you need the broader MEG825 feature set on that product page. Confirm jaw size and whether you need current (C type) when you ask for a quote.

Case study: fast ground resistance checks on looped systems

In a typical earthing survey, telecom towers, power and industrial sites have many bonded earth points, and testing each with stakes and disconnected leads takes time and interrupts protection.

A clamp-on ground resistance tester measures loop resistance by clamping around the earth conductor, without auxiliary stakes or disconnecting the down lead, on systems where a parallel earth path exists. Readings appear in about half a second, and an alarm can warn when a value exceeds a set limit.

Technicians clamp each earth lead in turn, store the readings, and compare them with earlier results or the site requirement. Points with high or rising values are then checked further.