A digital multimeter is the one tool that turns "I think the fuse has gone" into a definite answer. Whether you are chasing a dead car battery, checking a plug, testing a continuity fault or fixing an appliance, it measures voltage, current, resistance and more, and a good one is safe, accurate and easy to read. These are the top picks, checked against current UK prices.
What to Look For
Safety rating (the most important thing). A multimeter's CAT rating tells you the electrical environments it can safely handle, and it is not worth risking your life to save a few pounds. Ratings run from CAT I up to CAT IV, each with a voltage limit — for example a meter rated CAT IV to 600 V for mains and supply work, or CAT III to 1000 V for industrial circuits, with a lower CAT IV 300 V figure on simpler models. For jobs around the home and car, look for at least a solid CAT III rating and buy from a maker that states the figure clearly.
Resolution and accuracy. "Counts" describe how fine a reading the meter can show — a 6,000-count meter reads more precisely than a basic 2,000-count one. If you work with mains electronics, also look for a True RMS meter, which reads modern, non-sinusoidal AC accurately where a cheap averaging meter would be wrong.
What it can measure. All multimeters do voltage, current and resistance, reading a huge span of voltages — from a 1.5 V or 9 V battery, through 5 V and 10 V hobby circuits, right up to 230 V mains. The more useful ones add continuity (with an audible beep), capacitance, frequency, diode testing and even temperature — handy for spotting an overheating component or checking a fridge, often accurate to within about 0.6 °C. A good meter is also precise: read a supply that is meant to be 10 V and a quality unit might show 9.997 V. Decide which functions you actually need.
Auto-ranging and ease of use. An auto-ranging meter picks the correct measurement range for you, which is far friendlier than manually guessing. A clear, backlit display, colour-coded sockets and non-contact voltage detection (which senses a live wire without touching it) all make a meter quicker and safer to use.
Build and handling. The little things matter on the bench and under the bonnet: a sturdy rubber holster that survives a drop, a fold-out stand so it can sit facing you, a decent set of probes and a sensible size. Some capable meters are bulky, while the smallest pocket models trade features and a stand for portability.
The Winner: Kaiweets HT118A
The Kaiweets HT118A (around £39.99) is the best multimeter for most people. It offers a genuinely broad feature set for a fair price and stands out on both usability and capability: it is rated CAT IV to 600 V, reads True RMS, is fully auto-ranging, includes non-contact current detection, and even has illuminated sockets that light the correct jacks for the measurement you have selected. Its only real drawback is that it is physically very large. But for a do-everything meter that is safe, capable and keenly priced, it is the clear pick for home, car and hobby use alike. Check the price on Amazon
Best Budget: Tesmen TM-510
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If you only need the basics and want to spend as little as possible, the Tesmen TM-510 (around £14.44) will keep you happy. It covers the everyday measurements a home user needs and is extremely small and pocketable. The compromises are honest at the price: it manages only 2,000 counts, there is no fold-out stand and no rubber sleeve, and the simple display is not backlit, so it can feel a little cheap in the hand. But for occasional checks — a battery, a fuse, a length of cable — it does the job for very little money. Check the price on Amazon
Also Tested
A few others are worth knowing about, though they are harder to buy in the UK. The AstroAI DT132A is cheaper than the winner and still very good, if you can find the exact model. The PeakTech 3440 is a professional, highly accurate instrument for those who can justify the cost, and the Voltcraft MT-52 is unusual in also measuring light and sound — but both are German-market brands with limited UK availability, so we have not linked them here.
How to Choose
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Start with the electrical work you will actually do. For a safe, capable, all-round meter that suits the home, the car and the hobby bench, the Kaiweets HT118A is the one to buy — its CAT IV rating, True RMS reading and auto-ranging cover almost everything, and the price is very fair. If you just want to check a battery or a fuse now and then and spend as little as possible, the tiny Tesmen TM-510 is enough. Whichever you choose, never skimp on the CAT safety rating for the voltages you will meet, favour auto-ranging and a backlit display, and pick True RMS if you work with mains electronics.
Verdict
The Kaiweets HT118A is the multimeter to buy for most people at around £39.99: a safe, feature-packed, auto-ranging True RMS meter rated CAT IV to 600 V, at a price that undercuts the professional names. The Tesmen TM-510 (around £14.44) is the tiny, no-frills budget choice for occasional jobs. Get the right meter and you will never again guess whether a circuit is live, a battery is flat or a fuse has blown.
