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Best socket tester UK

Updated: 22 October 2026

You are choosing a plug-in checker from this amazon.co.uk set, and the highest star average is a 120 V and 260 V listing with 18 reviews. The best socket tester UK, on this shelf, is the one whose maker publishes the limit of the test, not the one with the busiest screen. None of these plugs shows earth fault loop impedance. That split is on the [socket tester buying guide](/hub/measuring-equipment/socket-tester/sub/socket-tester-buying-guide). Shelf prices and review counts sit in the [socket tester comparison](/hub/measuring-equipment/socket-tester). This page is from the Products Compared editorial team, updated on 21 October 2026. A qualifying purchase can earn us a commission at no extra cost to you.

You are choosing a plug-in checker from this amazon.co.uk set, and the highest star average is a 120 V and 260 V listing with 18 reviews.

Our top picks

Martindale Martindale BZ101 Buzz-It

Best overall

Martindale Martindale BZ101 Buzz-It
8.4/10about £17.34
View offer
Kewtech Kewtech KEWCHECK 103

Alternative

Kewtech Kewtech KEWCHECK 103
8.0/10about £22.00
View offer
KAIWEETS KAIWEETS HT106E

Best value

KAIWEETS KAIWEETS HT106E
6.9/10about £11.99
View offer
On this page
  1. 1.What best can mean in this set
  2. 2.Audible checkers
  3. 3.LCD plugs
  4. 4.Kits and the plugs to treat cautiously

What best can mean in this set

Best is a role, not a single safety ranking. A named buzzer is for hearing the socket from the consumer unit. An LCD is for a rough voltage figure and an RCD button. Stars mislead. The QUIWILL HT97E is 4.8 from 18 ratings on a file that says both 120 Volt AC outlets and 260 V, with no BS 1363 line. The BZ101 is the top pick because the maker publishes an open-earth threshold around 50 kilohms. The HT106E is the best value at £11.99 if you will not treat the screen as a meter.

Audible checkers

The BZ101 is £17.34. It claims 28 fault conditions and a buzzer reviewers hear at the consumer unit. The data sheet says mains powered and an open-earth call above about 50 kilohms. Amazon says battery powered, a conflict, not a reason to fit cells. The KEWCHECK 103 is £22.00 and 4.6 from 2,407 ratings, with a steady tone or a warble. Some call the beep piercing, and the sounder failed in individual reviews. Both remain simple testers. Proving one on a known socket is on the how to use a socket tester page.
Martindale Martindale BZ101 Buzz-It

Testsieger

Martindale Martindale BZ101 Buzz-It
8.4/10about £17.34
View offer

LCD plugs

The HT106E at £11.99 is 4.6 from 1,700 ratings, with seven indications. The listing warns that the RCD button may trip the house. More than one review puts the voltage about 20 V out, and there is no tone. Do not use the digit to judge the ESQCR window of 216.2 V to 253 V at the supply terminals. The title says CAT II 300 V and a bullet says CAT III. The HT107E at £12.97 disagrees with other meters, including a Fluke 87. The QUIWILL HT97E mixes 120 V and 260 V, and GFCI on that title is US wording.

Kits and the plugs to treat cautiously

The Proster kit at £18.69 adds a non-contact pen. The pen beeps and the socket tester does not. One review puts the plug about 10 V low, and others describe the plug, the pen, or both failing within about two months. Do not use the pen to prove a circuit dead. The holder kit at £24.55 has no Customer Reviews line and a voltage block of 100 to 220 V. The Grosion Oulya205 prints 10 g and 10 mm, which is not a 13 A plug. For a loop figure, leave the set.

Common questions

Is the Martindale BZ101 better than the Kewtech KEWCHECK 103?
On a published open-earth limit, the BZ101 is clearer: about 50 kilohms on the data sheet, against a Kewtech pass defined as three greens and a steady tone. On review depth, the Kewtech wins, 2,407 ratings against 674, though its sounder failed in individual reviews. Twenty-eight conditions against 14 is not a safety score. Pick the BZ101 for the threshold and the fuse-finder tone. Pick the Kewtech for the sample and the warble. Neither measures loop impedance.
Is the 4.8-star QUIWILL the best because of the stars?
No. The QUIWILL HT97E is 4.8 from 18 ratings, and the same listing says 120 V AC outlets and 260 V without a BS 1363 line. Five UK reviews are short and friendly. That average is not a quality win over the BZ101 or the KEWCHECK 103, which have a named UK use and hundreds or thousands of ratings.
Should I pay more for an LCD and an RCD button?
Pay £11.99 for the HT106E if you want a digit and a trip button and you will treat both as rough. Do not pay it instead of a buzzer if you work alone at the consumer unit, because that listing has no tone. The button can open the protective device, and the screen has been about 20 V out in more than one review. It is not a timed RCD test or a loop band.
Which one can I hear from the fuse box?
The BZ101 and the KEWCHECK 103. Reviewers describe the Martindale tone at the consumer unit and the Kewtech beep from other rooms. On the Kewtech, a steady tone is the pass and a warble is a fault. The HT106E and the HT107E have no buzzer, so you have to walk back and look at the screen.
Is the Proster kit better because it includes a pen?
The pen is an extra tool, not a better socket test. It beeps. The plug beside it does not. One review found the voltage almost 10 V low, and there are reports of early failure after the RCD button was used. A non-contact pen must not be used to prove a circuit dead. Buy the kit for the pair of tools, not for a safer earth reading.
What should an electrician buy if they need a number for a certificate?
Not a plug from this set. A certificate that needs earth fault loop impedance wants an instrument to BS EN 61557-3, or an advanced tester that shows a loop band, such as a Martindale EZ365, which is not in this comparison. The BZ101 is a fair first look in a tool bag. It is not the figure you write down as Zs.

Related pages

Socket tester RCD test

Socket tester

Socket tester buying guide: the earth loop comes first

How to use a socket tester without calling a glow a pass

Socket tester lights meaning: use this legend only

Sources

Public UK sources from the research digest, last checked on 21 October 2026. Shelf prices and star lines are the amazon.co.uk figures captured with these eleven listings. The price bands are this set, not a market average.

  1. Electrical Safety First, Best Practice Guide 8, Issue 2 (February 2015) (retrieved 21 October 2026)
  2. HSE: electricity FAQ (retrieved 21 October 2026)
  3. ESQCR 2002, regulation 27 (retrieved 21 October 2026)
  4. SP Energy Networks: voltage changes (retrieved 21 October 2026)
  5. Martindale BZ101 data sheet (retrieved 21 October 2026)
  6. Kewtech KEWCHECK 103 (retrieved 21 October 2026)
  7. BEAMA RCD handbook 2018 (retrieved 21 October 2026)
  8. amazon.co.uk, Martindale BZ101 listing (retrieved 21 October 2026)