Rank #4 in Best Digital Multimeter 2026: 10 Ranked, and the Number That Doesn't Measure Anything
TESMEN TM-510 Smart 4000-Count Voltage Tester
Price and rating as shown on Amazon when we collected them. Both change.
The TESMEN TM-510 is a 4,000-count digital multimeter priced at £16.99, rated 4.6 out of 5 from 13,613 ratings, and it sits fourth in this guide. Its headline feature is a Smart Auto Mode: the listing says it switches between measurement tasks on its own, so there is no mode or range to set before you take a reading. It also has non-contact voltage detection, which gives a visual and audible alarm without you connecting to a live AC wire. Its 13,613 ratings are well short of the 55,860 on the £11.99 meter at the top of this guide.
The number worth checking here is the one that is missing rather than the one in the title. TESMEN sells the TM-510 as a multimeter, and the specification table lists its measurement type as "Multimeter, Voltmeter" — but the bullet points that describe what it actually measures name AC/DC voltage, resistance and continuity, and nothing further. There is no current range listed for it at all, AC or DC, and no capacitance, frequency or temperature either. The cheaper meter at the top of this guide is the one the article describes as reading DC current. The rating breakdown is likewise top-heavy: 75% five-star against 2% one-star. Everything on this page comes from the Amazon listing, not from any testing of our own.
How those 13,613 ratings break down
An average hides its own shape. This is the spread behind the 4.6 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £16.99 |
|---|---|
| Customer rating | 4.6 out of 5 from 13,613 ratings |
| Counts | 4,000 counts |
| Measurement type | Multimeter, Voltmeter (as listed) |
| Maximum operating voltage | 600 Volts |
| Safety certification | CAT II 600V, CE, RoHS |
| Best Sellers Rank | 9th in Multi Testers |
| Number of Items | 1 (as listed) — the same listing separately names 2 test leads, 2 AAA batteries, a storage bag and a manual |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“So simple to use, no more having to use a dial to select the right type of electricity, high voltage mains or a small 3v battery, it just knows. The 'live' detector works well. It won't detect buried wires in a wall, but it will tell you if a light switch, plug socket or flex is live. Ideal for the general handyman and DIY'er”
Verified purchase“Great quality, clear instructions. The 'find the hidden mains cable' is extremely useful. Wonderfully versatile and has a readable manual in English!! Excellent value for money and highly recommended.”
What it is up against
The rivals it was ranked against in Best Digital Multimeter 2026: 10 Ranked, and the Number That Doesn't Measure Anything.
Questions people ask
What can the TESMEN TM-510 measure?
The listing's bullet points name AC/DC voltage, resistance and continuity, plus non-contact voltage detection. No current, capacitance, frequency or temperature range is mentioned for it.
Does the TESMEN TM-510 have a current range?
The seller's own bullets list AC/DC voltage, resistance and continuity only. No current measurement of any kind appears in the listing for this meter.
How do I use it — do I need to set a dial?
The listing says the Smart Auto Mode switches between measurement tasks without you selecting a mode or range. One reviewer describes it as "no more having to use a dial to select the right type of electricity".
How does the non-contact voltage function work?
The listing says it gives a visual and audible alarm so you can measure voltage on an AC wire without connecting to it. One reviewer notes it will not detect buried wires in a wall, but will tell you whether a switch, socket or flex is live.
What is included in the box?
The listing names a TM-510 multimeter, 2 test leads, 2 AAA batteries, a storage bag and a user manual.
What safety ratings does it carry?
CAT II 600V, CE and RoHS certified, with overload protection measures used inside the instrument, according to the listing.
Comments
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