Bug finder buying guide
Updated: 22 October 2026
You are on amazon.co.uk looking at handheld bug finders whose titles all sound alike, and you need a decision order before the model table. A bug finder buying guide starts with three modes you can name, then a sensitivity control and a quiet alert, then what a beep cannot prove. Shelf prices here run from £9.99 to £179.98. The [bug finder comparison](/hub/electronic-surveillance/bug-finder) holds the twelve-model table. This page does not crown a unit or walk a room. This page is from Peter F., editor for DIY & tools. Figures are from those listings and public UK sources, not a lab test.
You are on amazon.co.uk looking at handheld bug finders whose titles all sound alike, and you need a decision order before the model table.
You are on amazon.co.uk looking at handheld bug finders whose titles all sound alike, and you need a decision order before the model table. A bug finder buying guide starts with three modes you can name, then a sensitivity control and a quiet alert, then what a beep cannot prove. Shelf prices here run from £9.99 to £179.98. The bug finder comparison holds the twelve-model table. This page does not crown a unit or walk a room. This page is from Peter F., editor for DIY & tools. Figures are from those listings and public UK sources, not a lab test.
Our top picks
| Badge | Product | Lens check | Sensitivity | Quiet alert | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  SFILOFEREE SFILOFEREE T19 | Infrared lens mode | Six levels | Not stated | 7.8 | about £29.99 | View offer |
 SIKVIO SIKVIO K18 | Viewfinder in reviews | Potentiometer | Not stated | 8.6 | about £44.99 | View offer | |
| Best value |  HawkSpy HawkSpy K18 | Infrared viewfinder | Knob | Vibration listed | 8.3 | about £40.92 | View offer |
On this page
Modes worth paying for
The first filter is a lens check, a radio-strength alarm, and a magnetic probe, named on the listing or in a review. Reviews of the JMDHKK K20 and the K-68 put magnet range at a few centimetres. Skip a radio-only page when the camera may be wired, off, or writing to a card. The AOBOCAM Hcd-001 and the KEULGOUL ZDS616 do not state a lens check. The AOBOCAM components cell says mini camera, which is not a viewfinder. The method choice is on the RF detector or lens finder page.
Sensitivity and a quiet alert
A router, a phone, and a smart TV trip a sensitive stick until you turn the control down. That control matters more than a gigahertz bullet. The HawkSpy K18 lists a knob plus sound and vibration, and touching the antenna sets the alarm off. The SIKVIO K18 lists a potentiometer. Vibration is not stated, and a review describes a loud beep and a refund. The SFILOFEREE T19 lists six levels and false-beeps beside a phone unless you lower them. One unit would not switch off. The sweep order is on the how to use a bug finder page.
What the beep cannot prove
A beep means radio energy, or in magnet mode a field. It does not name the device, and it does not mean you have found a bug. Radio mode misses a wired camera and a camera that is not transmitting. A tracker that sends in short bursts can sit quiet on one pass. Lines that say 99.9 per cent, military, or AI are bullets, not a detection rate for these twelve units. A quiet detector heard nothing. That is not a clear room. If you cannot separate the alarm from the building’s radios and the stakes are high, FCDO Services points a workplace towards a specialist sweep.
Price bands on amazon.co.uk
Entry, about £10 to £30: Mystery Code M18 £9.99, XiflLife S505 £20.99, AOBOCAM Hcd-001 £24.99, Souhpyh S502 £25.99, SFILOFEREE T19 £29.99. Mid, about £40 to £80: HawkSpy K18 £40.92, SIKVIO K18 £44.99, JMDHKK K20 £46.99, FOWARD GAUSS BK19 £65.99, JMDHKK K-68 £76.99. Upper end: KEULGOUL ZDS616 £105.89 and JMDHKK M8000 £179.98. Deepest counts: SIKVIO 4.2 from 1,229, K-68 3.8 from 958, M8000 4.0 from 865, K20 3.7 from 420. The ZDS616 bullet says 50 g and the table says 190 g. The S502 bullet says 1.06 oz and the table says 90 g. The K-68 item-count cell says 35, which is not one detector.
Law and quality
Ofcom says receivers are generally exempt from a wireless-telegraphy licence if they cannot transmit, and it does not give case-by-case advice. A strength beep is not obtaining the content of a message. The Wireless Telegraphy Act 2006, section 48, and the Investigatory Powers Act 2016, sections 3 and 4, deal with content you are not meant to receive. The Consumer Rights Act 2015, section 9, is the route if a unit will not hold a charge or the box does not match the listing. Most boxes list a USB cable, not a BS 1363 plug.
Common questions
What three modes should a bug finder have before you care about the gigahertz line?
Look for a lens check, a radio-strength mode, and a magnetic probe, each named on the listing or in a review. The gigahertz span on a bullet is a claim, not a measured distance and not a detection rate. A radio-only stick is the wrong first buy when the camera may be off, wired, or recording to a card.
Is a £9.99 detector a false economy if it has 15 listing reviews and three texts?
The Mystery Code M18 is £9.99 with a line of 3.8 from 15 reviews, and three texts, all dated 21 October 2025. None describes a fault. That is a low shelf price with almost no failure mode on the page, a weak basis for a buy beside a £45 K18. Mid-price files are where reviewers describe false alarms, short magnet range, and refunds.
Why does a sensitivity control matter in a UK home with Wi-Fi?
Routers, phones, and smart TVs are real radio sources, so a stick on high sensitivity will beep in an ordinary flat. A knob or a set of levels is how reviewers separate that background from a nearer source. The HawkSpy knob, the SIKVIO potentiometer, and the T19’s six levels are the controls this set actually names. Without one, you only have a beep you cannot turn down.
Does owning a receive-only detector need an Ofcom licence?
Ofcom says receivers are generally exempt from a wireless-telegraphy licence if they cannot transmit. That is not case-by-case legal advice, and it is not a licence to intercept the content of a call or a camera feed. A strength indication is the use these listings describe. Obtaining or disclosing message content is the offence set out in the Wireless Telegraphy Act 2006, section 48, and the Investigatory Powers Act 2016, sections 3 and 4.
What must this page refuse to claim?
It will not claim a detection rate, a 99.9 per cent figure, or a military certification. It will not claim a gigahertz range was measured, that a quiet room is a clear room, or that a beep is a bug. The files do not show a UKCA mark, and these sticks do not replace a technical-surveillance specialist.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 20 October 2026.
- Investigatory Powers Act 2016, sections 3 and 4 (retrieved 20 October 2026)
- Wireless Telegraphy Act 2006, section 48 (retrieved 20 October 2026)
- Ofcom, Radio spectrum and the law (retrieved 20 October 2026)
- Sexual Offences Act 2003, section 67 (retrieved 20 October 2026)
- GOV.UK, Covert surveillance and property interference code of practice (retrieved 20 October 2026)
- FCDO Services, Detecting hidden cameras at work (retrieved 20 October 2026)
- Consumer Rights Act 2015, section 9 (retrieved 20 October 2026)
- amazon.co.uk, SIKVIO K18 listing (retrieved 20 October 2026)