A multimeter is one of those tools where buying the wrong one will quietly cost you. The £25 special at the supermarket will measure 230V the same as a £400 Fluke does on a sunny Tuesday — but the day you stick the probes into a three-phase distribution board, the cheap meter is the one that throws a fireball at your face. CAT ratings, fused inputs, true RMS and proper input protection are not optional for trade work; they’re the difference between a quick fault diagnosis and a trip to A&E.
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We’ve shortlisted the five multimeters most worth a UK tradesperson’s money — from the Fluke 87V Max for industrial-grade sparks, through mid-range installer meters, down to a budget meter for plumbers and second-fix carpenters who need a meter once a fortnight. All prices are approximate UK retail and exclude any test leads or accessory upgrades.
If you only have time to read one line: buy the Fluke 117 if you’re an electrician, the Martindale MM65 if you’re an installer who wants a proper UK trade brand at a sensible price, the Klein MM420 if you want the most safety per pound, and the Draper 92433 if a multimeter is a once-a-week tool and you’d rather spend the money on a better drill.
Our quick verdict
Best all-round meter for UK electricians: Fluke 117. CAT III 600V, true RMS, low-impedance (LoZ) mode for ghost voltages, integrated non-contact voltage detector and a build that’s shrugged off twenty years of trade abuse without changing its design. Around £230-260.
Best heavy-duty meter for industrial and plant work: Fluke 87V Max. Higher resolution, CAT III 1000V, IP67 waterproof/dustproof case, and the meter most maintenance engineers reach for first. Around £600-640.
Best value for installation electricians: Martindale MM65. A trusted UK test-equipment brand, auto-ranging, a properly readable display and sold directly by Amazon. Around £100-110.
Best safety-per-pound: Klein MM420. CAT III/CAT IV-rated leads at around £85-90. The spec sheet is hard to argue with at the money.
Best budget meter for non-electricians: Draper 92433. True RMS, auto-ranging, and a price that means you can keep one in every van. Around £45-55.
Specs at a glance
Model | CAT rating | True RMS | NCV | Typical UK price |
Fluke 117 | CAT III 600V | Yes | Yes | £230-260 |
Fluke 87V Max | CAT III 1000V | Yes | No | £600-640 |
Martindale MM65 | CAT III | Yes | No | £100-110 |
Klein MM420 | CAT III / CAT IV (leads) | Yes | No | £85-90 |
Draper 92433 | CAT III 600V | Yes | No | £45-55 |
The 5 best multimeters for UK tradespeople
Fluke 117 — Best all-round for UK electricians
Price: Around £230-260 (Screwfix, CEF, Toolstation, Amazon UK)
The Fluke 117 is the meter that ends arguments on a commercial jobsite. It’s not the most accurate Fluke (the 87V Max is), it’s not the cheapest CAT III (Klein and Martindale are both cheaper), but it’s the one that lasts the longest in the real world and the one that almost every UK sparks ends up owning eventually.
The key features for UK trade use: CAT III 600V safety rating, true RMS, AutoVolt automatic AC/DC voltage selection, LoZ mode for stripping out ghost/induced voltages on long cable runs, and a built-in non-contact voltage detector in the top of the meter. The min/max/avg recording is useful for chasing intermittent faults, and the input jacks are properly shrouded.
- Pros: best build quality in the £200-300 band, LoZ mode is genuinely useful in UK installs, integrated NCV detector, 3-year trade-grade warranty.
- Cons: 600V CAT III only — not enough headroom for direct work on three-phase 415V LV switchgear, back-light auto-off is short.
Fluke 87V Max — Best heavy-duty for industrial work
The 87V Max is the meter you buy when ‘good enough’ isn’t. It gives you CAT III 1000V rated measurement, an IP67 waterproof and dustproof case, and MC4 solar test leads included — genuinely useful for plant maintenance and renewables work as well as general industrial fault-finding. It’s the meter most maintenance engineers reach for first when a job can’t afford a wrong reading.
- Pros: highest accuracy in this list, IP67 sealed case, MC4 leads included, 3-year warranty.
- Cons: no integrated NCV, well over double the price of the 117, overkill for domestic and small-commercial work.
Martindale MM65 — Best value for installation electricians
Martindale is a long-established UK test-equipment brand and the MM65 is a straightforward, auto-ranging multimeter sold directly by Amazon rather than through third-party marketplace sellers, which matters when you want a proper warranty trail on a meter you’ll rely on. The build is solid for the money and the display is easy to read on site.
- Pros: sold and dispatched by Amazon, auto-ranging, sensible UK trade price point, respected UK brand.
- Cons: not part of the Megger MFT accessory ecosystem, fewer advanced features than the Fluke picks.
Klein Tools MM420 — Best safety-per-pound
Klein has been the rising-star meter brand in the UK over the last few years. The MM420 is an Amazon’s Choice pick that comes complete with a carrying case and test leads fitted with CAT III/CAT IV safety caps — a properly specced package at a price that’s roughly a third of the Fluke 117.
- Pros: CAT III/CAT IV-rated lead set included, true RMS, well reviewed, complete kit with carrying case.
- Cons: no integrated NCV, plastic case rather than a rubberised over-mould, less common at UK electrical wholesalers than Fluke.
Draper 92433 — Best budget meter for non-electricians
Not every tradesman needs a Fluke. Plumbers, heating engineers, kitchen fitters and second-fix carpenters use a meter often enough to need a real one but rarely enough that £250 is hard to justify. The Draper 92433 is the meter for that bracket — auto-ranging, true RMS, and a price that means you can keep one in every van without a second thought.
- Pros: properly priced for occasional use, true RMS, well-stocked on Amazon UK, 12-month warranty.
- Cons: not a serious LV distribution meter, fewer safety-rated features than the trade-grade picks above.
What actually matters when buying a multimeter for UK trade work
CAT rating — the only spec that protects you
A CAT rating describes the meter’s ability to withstand a transient overvoltage spike without exploding. CAT III 600V is the minimum sensible spec for any UK domestic or light commercial installation work. CAT IV 600V is required for direct work on the supply side of the consumer unit, including DNO cut-out fuses and origin testing. A ‘CAT II 600V’ rating (which most supermarket meters carry) is rated only for socket-circuit measurements and will not survive a transient on a distribution board.
True RMS vs average-responding
All five meters in this guide are true RMS. Average-responding meters give correct readings on pure 50Hz sine waves but underestimate the voltage on anything modern — LED lighting circuits, VFDs, EV chargers, switch-mode supplies. True RMS is non-negotiable on any meter you’ll use today because almost every load on a UK installation is now non-linear to some degree.
Input protection and fuses
Fluke, Klein and Martindale meters in this list use properly rated fuses on the current inputs. That matters because if you accidentally connect the meter across mains while in current mode (a depressingly common mistake), a good fuse breaks safely instead of exploding. Cheaper meters from no-name brands often use ordinary ceramic fuses that will arc through and blow the case off the meter.
Where to buy in the UK
Fluke meters are best bought from a recognised electrical wholesaler (CEF, Edmundson, City Electrical) or Amazon UK sold-and-shipped listings — counterfeit Fluke units have shown up enough times on marketplace listings that we’d recommend checking the seller is Amazon or the brand itself. Klein, Martindale and Draper meters are safest from Amazon UK direct or Toolstation/Trade Counter Direct in-store.
Don’t buy a multimeter from a supermarket, a pound shop or eBay-listed ‘Fluke’ units sold below £100. The fakes are convincing externally and dangerous internally.
Final verdict
For most UK electricians, the Fluke 117 is still the best multimeter to own. It’s the right balance of safety rating, feature set, build quality and resale value, and it’ll do 95% of the work a UK installer needs to do without ever being in over its head. If you’re working on industrial three-phase regularly, step up to the Fluke 87V Max. If you’re a plumber, gas engineer or second-fix carpenter, the Draper 92433 is more than enough meter for what you’ll actually do with it and leaves money in the kitty for a better drill, drill bits or torque wrench.
Whichever you go for, keep the test leads in a separate pouch, recalibrate every two to three years, and never — ever — leave the meter in current mode at the end of the day.
FAQs
Is a £30 multimeter safe for UK domestic work?
Probably not. Most £30 meters are CAT II 600V or unrated, and the input fuses are typically ordinary ceramic — neither is adequate for measuring directly at a consumer unit or any circuit upstream of a socket outlet. Spend at least £45 on a Draper 92433 or equivalent if you want a meter that won’t hurt you on 230V.
What does ‘true RMS’ mean and do I need it?
True RMS (root mean square) means the meter accurately measures the heating value of an AC waveform regardless of its shape. Modern UK loads (LEDs, EVs, inverter HVAC) are non-sinusoidal, and an average-responding meter will underread voltage and current on them by 10-30%. Yes — you need it.
How often should I recalibrate?
Every two years for general trade use, every year if the meter is used for Part P installation certificates or for testing where the readings get formally recorded (PAT, EICR, commissioning sheets).
Are NCV (non-contact voltage) detectors reliable?
Useful but never definitive. An NCV detector tells you a wire is probably live; it doesn’t tell you a wire is definitely dead. Always confirm dead with a proper two-pole tester or with your multimeter set to AC volts in LoZ mode. NCV pens are good for first-pass screening, not for proving isolation.
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