Kewtech, a leading manufacturer of professional electrical test equipment, presents your guide to the ultimate MFT and explains why it is fast becoming the industry favourite.
Every electrical contractor knows that testing isn’t just about ticking boxes. It’s about confidence. Confidence that your readings are accurate, your results are defensible, and your equipment won’t let you down when you’re under pressure on site. That’s why Kewtech has spent decades designing test instruments with one clear philosophy in mind: make electrical testing faster, simpler and safer for the UK electrician.
The KT66DL multifunction tester is a perfect example of that approach. Rather than chasing gimmicks or unnecessary complexity, it focuses on solving real-world testing problems – noisy environments, sensitive RCDs, EV circuits, tight timescales and demanding clients, all the while remaining intuitive and easy to use. This is a tester designed by people who understand how electricians actually work.
Loop test accuracy: because everything depends on it
At the heart of safe electrical installations is accurate loop impedance testing. If your loop values are wrong, disconnection times may not be met and protective devices may not operate as intended. That’s why loop accuracy has always been a cornerstone of Kewtech design.
The KT66DL delivers highly accurate and, importantly, repeatable loop values, time after time, even in challenging conditions. This accuracy gives contractors confidence that what they’re recording is genuinely representative of the installation, not distorted by noise, uplift or unstable supply conditions. When certification, liability and reputation are on the line, that confidence matters.
2-Wire low current no-trip loop testing
One of the biggest frustrations during testing is nuisance RCD tripping. It slows the job down, disrupts occupants, and can lead to unnecessary call-backs.
The KT66DL’s 2-wire low-current no-trip loop test is designed to remove that problem entirely. It allows you to carry out loop testing quickly and safely at light fittings and light switches where a high-current two-wire test would trip the RCD. Fewer interruptions mean faster inspections and a smoother experience for both contractor and client.
High-current loop testing where precision really counts
Not all loop testing is equal. When you’re testing close to a supply transformer, loop values can be extremely low – and many testers simply don’t have the resolution to cope.
The KT66DL includes two high-current loop test settings: a 6A test and a 25A test with 0.001Ω resolution. That level of precision makes it ideal for testing near the origin of the supply, where accuracy is critical.
The 25A test enables a genuine 50kA PFC range, giving contractors confidence that prospective fault current readings are accurate even in demanding commercial and industrial installations. This removes guesswork and ensures protective devices are correctly rated.
Reliable results in noisy environments
Real sites are rarely electrically “clean”. Machinery, inverters and other connected equipment introduce noise that can cause unstable readings.
The KT66DL automatically detects this and activates its noise handling feature, extending the test and measuring at different frequencies to deliver a stable, usable result. Combined with Kewtech’s renowned resistance to RCD uplift, this ensures that readings remain reliable even in hostile environments.
The benefit is simple: less frustration, fewer failed tests, and more confidence in the numbers you’re recording.
Designed for real installations, not ideal ones
Oxidised terminations and aged connections are a fact of life, especially on older or industrial installations.
The KT66DL’s PULSE function applies a short burst of high current to clean the contact point and remove surface oxidation. This produces more stable and repeatable readings, saving time and avoiding misleading results.
Again, it’s a practical feature that exists because Kewtech designs testers for the conditions electricians actually face.
Extra-low current loop testing for EV installations
EV charge points bring new challenges, particularly with over-sensitive RCD protection that can trip during conventional loop testing.
The KT66DL includes a specialist extra-low current loop test specifically for EV circuits, allowing testing to be carried out without nuisance tripping. As EV installations continue to grow, this feature ensures contractors can test confidently without workarounds or compromises.
Coupled with the KEWEVSE or KEWEVA adaptors, the KT66DL will carry out a full auto EVSE RCD test covering both the internal EV DC and AC protective devices but also the external EV circuit RCD / RCBO.
It’s a clear demonstration of Kewtech future-proofing of its products for modern electrical work.
Insulation/continuity testing with built-in protection
Mistakes happen – especially on busy sites. Connecting an insulation/continuity tester to a live circuit can be costly if the instrument isn’t protected.
The KT66DL warns you if it detects a live circuit, and even if the test button is locked, internal protection prevents damage to the PCB. This protects both the tester and your investment, helping ensure long-term reliability.
Kewtech builds longevity into its MFTs, which is why many contractors continue using them for years rather than replacing them every upgrade cycle.
No touch screen… which Kewtech is proud of
There is no touch screen on Kewtech MFTs… and that’s to your benefit, the company says.
Kewtech’s dot matrix screen provides clear, reliable visibility in all site conditions and can be operated easily with gloves, wet hands or in cold weather while also offering significantly lower repair costs should the unthinkable happen. This all helps to reduce downtime and long-term ownership costs. In contrast, touch screens tend to be more fragile, costly to replace and often uneconomical if damaged.
All on one screen
The KT66DL displays all key test results simultaneously on a single screen, eliminating the need to scroll through menus or repeat tests. RCD results, PSC/PFC and even simultaneous TRMS display of L-PE, L-N and N-PE are all there to provide you with a complete, instant overview of circuit conditions, speeds up fault current assessment, and make testing more efficient.
SPD testing
The KT66DL makes SPD (Surge Protection Device) testing quick and straightforward, allowing contractors to verify that SPDs are functioning correctly without damaging the life of the SPD. By quickly identifying faulty or degraded surge protection, the tester helps protect sensitive equipment, ensures compliance, and gives electricians confidence that the installation is safe and reliable – saving time and preventing costly damage for clients.
One tester, multiple capabilities
The KT66DL provides a range of additional features, including:
- Phase rotation testing
- Earth electrode testing (2-wire and 3-wire)
- PAT testing with the optional adapter
Help at your fingertips – no manual required
With such a feature-rich tester, you would be forgiven for thinking that with such capabilities must come a level of complexity that you would rather avoid. But rest assured that it’s intuitive, user-friendly operation means this simply isn’t the case… we bet you won’t even have to consult the manual to start testing straight away.
Just a single rotary dial, clear all-in-one result screens, logical menu structure and dedicated help buttons providing on-screen guidance, all help to reduce training time, speed up testing, and ensure new to Kewtech users can hit the ground running.
Accuracy starts with the test leads
A tester is only as good as the test leads that are connecting it to the installation. That’s why Kewtech prides itself on its G7 Precision test leads, designed with unrivalled accuracy and durability.
Kewtech universal test leads are put through a rigorous seven-step testing procedure to ensure that they stand up to the demands of the everyday contractor, providing reliable contact, consistent readings and long service life.
Support you can rely on
Kewtech MFTs are known for their longevity. Contractors buy them knowing they’re investing in their future and in equipment that will last.
Just as importantly, Kewtech is proud of the feedback it receives on its excellent customer service. Real technical support is always on hand, offering advice, guidance and reassurance when needed. Kewtech understands that this level of backup matters when your tester is central to your livelihood, and the company is genuine in its approach to after-sales care.
Kewtech is with you every step of the way – just ask one of the thousands of trusting Kewtech users across the UK.
A tester designed around the electrician
The KT66DL isn’t just a multifunction tester; it’s a reflection of Kewtech’s design philosophy. Every feature is there to make testing faster, simpler and safer, all the while excelling in accuracy and repeatability of results.
For UK electrical contractors who want a reliable, long-term investment backed by real support, Kewtech and the KT66DL isn’t just another tool – it’s a partner you can depend on, job after job.
Scan the QR code below to view the KT66DL in action, or visit kewtechcorp.com.
