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SONEL MMR-650 Low Resistance Meter

Designed to measure very low resistances of both resistive and inductive types of objects, including amorphous core transformers.

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Box 9kg 55L 42W 22H
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The Sonel MMR-650 Low Resistance Meter is designed to measure very low resistances of both resistive and inductive types of objects, including amorphous core transformers. This product is engineered for use in power plants, railways and maintenance companies to measure welded and soldered connections, equipotential bondings, earthing conductors, contacts, bolted connections, windings of motors and power transformers and other resistive and inductive objects.

The MMR-650 can also be utilised on production lines (e.g. at the final production control stage). It’s an innovative combination of a high-performance measuring device with a modern user interface and an advanced data management system. Wireless data transmission, an enhanced system of 2D codes and the ability to print labels to identify test items all contribute to a new quality of work and allow the user to perform a wide range of measurements.

Key Features

  • Li-Ion battery power recharges in 3.5 hours
  • It can be operated with mains power
  • Over 700 10 Amp tests between charges
  • Measurements from 0.1µΩ to 2,000Ω
  • Class-leading 0.25% accuracy
  • Built-in back EMF discharge and demagnetisation of windings
  • Temperature compensation & heat run analysis with included temperature probe
  • No switches! The MMR-650 is fully controlled from the full-colour touch screen, just like your smartphone or tablet
  • Supplied with both Kelvin Clips and Kelvin Spike Probes



Ranges: 1000µΩ, 2, 20, 200, 1000mΩ, 2, 20, 200, 2000Ω

Resolution: 0.1µΩ to 0.1Ω

Accuracy: ±0.25% reading +2 digits

Measurement time – resistive: 3s

Measurement time – inductive: 5s or greater

Protection from external voltage: 600V AC for 10s

Communication: USB, WiFi & optional LAN

Memory: 990 measurements in 10 banks of 99


Power Supply

Battery: 7.2V, 8.8Ah Li-Ion

AC Supply/charger: 90-265V, 50Hz

Battery charging time: 3.5 hours

Number of 10A tests per charge: 700-800

Auto Off: User-definable from 5 to 45 minutes or continuous



Measurement Category: Cat 3, 600V to IEC 61010

User interface: 800 x 400 Colour TFT graphical display

Protection grade: IP67 lid closed, IP54 lid open, IP40 lid open and mains-powered

Working temperature: -10 to +50°C

Relative humidity: 40 – 60%


  • Power plants — In power plants, the MMR-650 is indispensable for ensuring the efficient operation and safety of electrical systems. It precisely measures low resistances in transformers and conductors, aiding in effective energy distribution and the maintenance of system reliability.
  • Railway systems — This meter is vital in maintaining safe and efficient operations in railway infrastructures by accurately assessing the resistance of rail bonds and electrical connections. This precise measurement is vital for the smooth functioning of railway electrical systems, ensuring safety and operational efficiency in the rail network.
  • Industrial maintenance — The MMR-650 is crucial for routine checks and troubleshooting in industrial facilities because it helps evaluate the integrity of connections and earth bonds. This helps in preventing equipment failure, ensuring operational safety and maintaining continuous production.
  • Quality control in manufacturing — In the manufacturing sector, especially in final-stage quality control, the MMR-650 verifies if products meet electrical standards. Its precise resistance measurements can confirm product quality, enhancing overall manufacturing excellence and ensuring the reliability of electrical components before they reach the market.
  • Electrical system installations — The meter is essential for gauging the integrity of new electrical installations, including earthing systems and bonding connections. It can help a professional certify if these installations meet safety standards and function optimally.

Rent the Sonel MMR-650 Low Resistance Meter today

Secure the Sonel MMR-650 Low Resistance Meter today from Brandis Hire, where customer needs are always prioritised. With no lock-in hire periods, you can rent equipment according to your project timelines. Enjoy added benefits like 4 hours of free technical support and convenient delivery and pickup options. Whether you’re in a major city or a regional area across Australia, we offer a range of industrial and electronic testing equipment at competitive rates.

Start your hassle-free rental experience now. Submit a booking request or contact us for more information.


Why choose the Sonel MMR-650 Low Resistance Meter?

Choosing the Sonel MMR-650 Low Resistance Meter means opting for a device renowned for its precision and versatility. This meter is specifically designed for measuring very low resistances in both resistive and inductive objects, making it an ideal choice for a variety of applications, including power plants, railways and industrial maintenance.

The MMR-650 is also user-friendly, featuring a full-colour touchscreen for easy operation and is equipped with both Kelvin Clips and Spike Probes to suit different testing needs. Additionally, its robust design includes a Li-Ion battery capable of over 700 10 Amp tests between charges, complemented by options for mains power usage. This blend of precision, versatility and user convenience makes the Sonel MMR-650 a top choice for professionals.

What other micro-ohmmeters do you offer for hire?

At Brandis Hire, we understand the importance of precise resistance measurements in various industries. To cater to different needs, we offer a diverse range of micro-ohmmeters for hire, each designed to deliver accuracy and efficiency. Our selection includes:

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SONEL MMR-650 Low Resistance Meter