Best Multifunction Testers UK (2026): Megger, Kewtech, Fluke, Metrel and Martindale
A multifunction tester (MFT) is the biggest single tool purchase most UK electricians make, and it needs to cover insulation resistance, continuity, loop impedance and RCD testing for certification. Here is how the main MFTs compare.
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For a straightforward, proven tester, the Megger MFT1711 has a simple interface and a fully automatic RCD test. If you want EV-ready testing and a colour screen, the Kewtech KT66DL is a 12-in-1 option. For certificates on site, the Fluke 1674 FC has programmable auto tests and connects to your phone or PC.
Multifunction Testers Compared
| Tester | Best for | Key detail from the listing |
|---|---|---|
| Megger MFT1711 | Simple, proven all-rounder | Beginner-friendly interface, fully automatic RCD test |
| Kewtech KT65 | Value 8-in-1 | Anti-trip loop testing, 250/500/1000V insulation |
| Kewtech KT66DL | EV-ready 12-in-1 | Large colour screen showing all auto-tests |
| Fluke 1674 FC | Certificates on site | Touch screen, programmable auto tests, SPD and IMD testing |
| Metrel MI3100S Eurotest Easi | IEC/EN 61557 testing | 50 to 1000V insulation, built-in help screens |
| Martindale ET6000 | 18th Edition installs | High current and non-trip loop, phase rotation |
The Best Multifunction Testers
1. Megger MFT1711
Best all-rounderMegger describes the MFT1711 as having a simple user interface with easy access to all the tests you need, a fully automatic RCD test and suitability for commercial, industrial and domestic low voltage installations.
2. Kewtech KT65
Best valueAn 8-in-1 tester with anti-trip technology, insulation tests at 250, 500 and 1000V with auto discharge, high and low current ATT loop testing, phase-to-phase loop tests and a large backlit display. Kewtech lists it as covering 55V loops for 110V centre-tapped site transformers.
3. Kewtech KT66DL
Best for EV workKewtech’s 12-in-1 tester adds enhanced loop testing for three and two-wire low current tests, a large colour screen that shows all auto-test results at once and EV testing capability.
4. Fluke 1674 FC
Best for on-site certificatesThe 1674 FC has a colour touch screen, programmable auto test sequences, surge protection device and insulation monitoring device testing, and lets you generate certificates on site from your phone or PC. Fluke lists it at under 1.6kg with a padded neck strap.
5. Metrel MI3100S Eurotest Easi
Best with built-in guidanceMetrel tests to IEC/EN 61557, with insulation resistance from 50 to 1000V, 200mA continuity with polarity change, built-in help screens and a built-in charger with rechargeable batteries.
6. Martindale ET6000
Best for 18th Edition installsMartindale lists the ET6000 as compliant with the 18th Edition wiring regulations, with high current and non-trip loop testing, a clear colour display, voltage measurement and phase rotation, supplied with a case and neck strap.
How to Choose a Multifunction Tester
- Check the tests you need. All MFTs cover the core tests, but EV, SPD and IMD testing vary by model.
- Think about certificates. Connected testers that sync to software save hours of typing.
- Look at loop testing. Non-trip loop tests avoid tripping RCDs during testing.
- Plan for calibration. Testers need regular calibration, so factor in the cost and downtime.
- Keep your voltage tester. An MFT does not replace a two-pole voltage tester for safe isolation.
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Frequently Asked Questions
What is the best multifunction tester for electricians in the UK?
Popular choices include the Megger MFT1711 for a simple, proven all-rounder, the Kewtech KT66DL for EV work, and the Fluke 1674 FC for generating certificates on site.
Do I need an EV multifunction tester?
Only if you install or test EV chargers. Testers such as the Kewtech KT66DL list EV testing capability.
How often should a multifunction tester be calibrated?
Most manufacturers and certification bodies expect annual calibration. Check your scheme provider’s requirements.
Related Guides
- Kewtech vs Megger Multifunction Testers
- UK Electricians Hub: Software, Quoting and Reviews
- Best Voltage Testers for Electricians UK
- Apprentice Electrician Tool List UK
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