Metrel MI-3125 Electrical Tester,  , Earth Resistance Measurement

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Multifunction testers or MFTs are handheld versatile devices used to verify the safety of electrical installations in domestic, commercial, and industrial settings. These installation testers are designed to streamline and simplify electrical testing processes and ensure that fixed wiring is safe and correctly installed to meet relevant local standards and safety requirements

Multifunction Testers are integral to compliance with the 18th Edition of the Wiring Regulations (BS 7671). They enable electricians to meet the stringent testing requirements outlined in the 18th Edition, ensuring that electrical installations are safe, reliable, and in line with the latest industry standards. Additionally, MFTs often conform to other international standards, enhancing their credibility and usability in diverse global contexts.

MFTs are ideal for testing a range of electrical parameters such as voltage, earth resistance, loop impedance and more. Many multifunction testers offer additional features such as Bluetooth, allowing you to store and transfer data from the device to a computer or mobile device. Here at RS, we have sourced multifunction test meters from leading brands such as Fluke, Megger, Gossen Metrawatt, RS PRO, and many more. You can learn more in our [multifunction testers guide](/web/content/discovery/ideas-and-advice/best-multifunction-tester).

### What are Multifunction testers also known as?

Multifunction Testers can be categorised with many different naming conventions, they are also commonly called Electrical Testers and Multifunction Installation Testers. However, even though they use slightly different names they all essentially do very similar things and due to their nature can be used in a range of different situations. It is important to check which tests the MFT can perform before you purchase one.

### Uses of Multifunction Testers

Multifunction testers perform a variety of tests, including:

- Insulation-continuity tests: Diagnose breakdown of the insulation in various parts of the electrical system such as wires, transformers, and motors. The quality of insulation is critical in ensuring uninterrupted and safe functioning of electrical circuits.
- Checking RCD devices: Check the proper functioning of residual-current devices (RCDs). RCDs are designed to disconnect quickly to mitigate the harm caused by electric shock and to avoid current leaks that may lead to fire and other dangerous situations.
- Loop testing: A quick, convenient, and specific method of evaluating an electrical circuit's ability to engage protective devices (circuit breakers, fuses, RCDs). A ground loop determines the effectiveness of protective devices.
- Resistance measurement of grounding systems: Verification tests to ensure that a system's resistance is low enough to provide protection to people, equipment and structures.
- Earth continuity tests

### Application

Multifunction testers are used by electrical engineers for electrical installation work to verify and maintain electrical installations and that the required safety regulations have been reached in both commercial and industrial applications.

### What is the difference between multimeters (multi testers) and multifunction testers?

They are both electronic measuring instruments. The multimeter measures basic electrical parameters such as voltage, current and resistance. A multifunction tester is tailored for comprehensive testing of electrical installations ensuring compliance with industry regulations and standards such as the Wiring Regulations (BS7671).



Multifunction Testers

Electrical Test & Measurement

Test & Measurement

Electrical, Automation & Cables

Automation & Control Gear

Automation Signalling

Contactors & Auxiliary Contacts

Electric Motors

Industrial Robots

PLCs, HMIs & Industrial Computing

Process Control

Sensors

Solenoids

Cables & Wires

AV Cables

Cable Glands & Fittings

Cable Joints & Cable Sleeving

Cable Management

Cable Ties & Fixings

Computer Cables

Electrical Power & Industrial Cables

Networking & Coaxial Cables

Single Core Cable

Wire to Board Cables & Ribbon Cable

Enclosures & Server Racks

19-Inch Racking

Enclosures

Enclosures & Racking Components

Fuses & Circuit Breakers

Circuit Breakers

Earth & Lightning Protection

Fuse Holders & Accessories

Fuses

HVAC, Fans & Thermal Management

Air Conditioning & Fans

Air Conditioning & Heating Accessories

Building Automation

Electronics Heating & Cooling Components

Fan Accessories

Lighting

Emergency Lighting & Safety Lighting

Light Bulbs, Lamps & Tubes

Light Fittings, Fixtures & Luminaires

Lighting Components

Torches & Inspection Lamps

Relays & Signal Conditioning

Relay Accessories

Relays

Signal Conditioners & Isolators

Switches

Capacitive, Magnetic and Piezo Switches

DIP & Rotary Encoded Switches

Domestic Installation Switches

Foot Switches & Components

Joysticks & Components

Key Switches & Selector Switches

Keyboard & Keypad Switches

Limit & Position Switches

Micro Switches & Detector Switches

Push Button Switches & Components

Rocker Switches & Components

Rope Pull Switches & Components

Rotary Switches & Components

Safety Enabling & Control Switches

Safety Interlock Switches & Components

Switch Disconnectors & Components

Toggle Switches & Slide Switches

Electronic Components, Power & Connectors

Batteries & Chargers

Battery & Charger Accessories

Battery Chargers & Power Banks

Non-Rechargeable Batteries

Rechargeable Batteries

Connectors

AV Connectors

Automotive Electrical Connectors

Backplane & Rack Connectors

Circular Connectors

IC Sockets & Adapters

Mains & DC Power Connectors

Network & Telecom Connectors

PCB Connectors & Wire Housings

Power Connectors

RF Coaxial Connectors & Adapters

Terminal Blocks

USB, D Sub & Computing Connectors

Wire Terminals & Splices

Displays & Optoelectronics

Display Modules

Fibre Optic Components

Indicators & Indicator Components

LED Lighting Components

LEDs - Light Emitting Diodes

Laser Modules & Components

Optocouplers & Photodetectors

ESD Control, Cleanroom & PCB Prototyping

ESD Control & Clean Room

PCB Etching, Preparation & Developing

PCB Handling

PCB Spacers, Pillars & Supports

PCB Tools

Prototyping Boards

Passive Components

Antennas

Capacitors

Crystals, Oscillators & Resonators

EMI Filters & Protection

Fixed Resistors

Inductors

Passive Components Kits

Rotary Encoders

Sounder, Buzzer & Microphone Components

Surge Protection Components

Variable Resistors

Power Supplies & Transformers

Power Supplies

Renewable Energy

Transformers

Voltage Converters

Raspberry Pi, Arduino, ROCK, STEM Education & Development Tools

Arduino Shop

BBC micro:bit Shop

Development Tools & Single Board Computers

ROCK SBC Shop

Raspberry Pi Shop

STEM Education

Semiconductors

Amplifiers & Comparators

Audio & Video ICs

Chip Programmers & Debuggers

Clock, Timing & Frequency ICs

Communication & Wireless Module ICs

Data Converters

Discrete Semiconductors

Interface ICs

Logic ICs

Memory Chips

Power Management ICs

Processors & Microcontrollers

Programmable Logic ICs

Sensor ICs

Mechanical, Fluid Power & Tools

Access, Storage & Material Handling

Ladders & Steps

Material Lifting & Loading Equipment

Storage & Shelving

Transit & Equipment Cases

Trucks, Trolleys & Lifting Tables

Adhesives, Sealants & Tapes

Adhesive, Sealant & Tape Dispensers

Adhesives & Glues

Sealants & Resins

Tapes

Bearings & Seals

Gaskets, Seals & Packings

Linear Motion

Rotary Bearings & Housing Units

Engineering Materials & Industrial Hardware

Anti Vibration & Levelling Components

Carbon Fibre & Felt Sheets

Castors & Wheels

Ceramic Materials

Channel Support Systems

Conveyor Components

Insulation Materials

Knobs, Levers & Handles

Metal Materials

Plastic & Rubber Materials

Polishing & Finishing

Shim Stock

Structural Systems

Fasteners & Fixings

Clips & Springs

Girder Fixings

Magnets & Magnetic Strips

Nails & Rivets

Nuts & Washers

Pins, Keys & Retaining Clips

Screws & Bolts

Sheet Metal & Panel Fasteners

Spacers & Standoffs

Wall Plugs, Fixings & Anchors

Hand Tools

Cable, Connector & Crimping Tools

Clamps & Vices

Hammers & Demolition

Metrel Multifunction Testers

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