Independent comparisons. We may earn from shop links. More info

How to use a hidden camera detector

Updated: 22 October 2026

You already have a multi-mode detector in a UK hotel room or a short let, and at full sensitivity it beeps at the router, your phone, and the room. That teaches you nothing about a camera. How to use a hidden camera detector is the order: prove the unit reacts, quiet it on a known transmitter, then walk slowly and treat every new beep as a place to look. The product rows stay on the [camera detector comparison](/hub/electronic-surveillance/camera-detector). This page does not rank the twelve. The order uses public manuals, FCDO Services, and review notes from this set, dated 21 October 2026. It is not a timed lab method.

You already have a multi-mode detector in a UK hotel room or a short let, and at full sensitivity it beeps at the router, your phone, and the room. That teaches you nothing about a camera.

Our top picks

SIKVIO SIKVIO K18

Best overall

SIKVIO SIKVIO K18
8.8/10about £44.99
View offer
FOWARD GAUSS FOWARD GAUSS BK19

Alternative

FOWARD GAUSS FOWARD GAUSS BK19
5.9/10about £65.99
View offer
HawkSpy HawkSpy K18

Best value

HawkSpy HawkSpy K18
6.5/10about £40.92
View offer
On this page
  1. 1.Set a baseline before you walk
  2. 2.Walk the places a lens can see the bed
  3. 3.Use the red window second
  4. 4.Quirks in this set
  5. 5.What a finished sweep still is not

Set a baseline before you walk

Put your own transmitters where you can see them. Switch the phone to flight mode or leave it in the bathroom, and switch off the room's Wi-Fi only if you can switch it back on. A router you cannot unplug is still a baseline. Fit the antenna, turn the control up until the unit reacts to your phone or the router, then down until that known source is quiet at arm's length. If it never goes quiet, you are still hearing the building.

Walk the places a lens can see the bed

Walk slowly, close to surfaces, and spend the time on objects that could hide a lens aimed at the bed, the desk, or the shower. Clocks, smoke alarms, air fresheners, chargers, USB sockets, TV boxes, and anything that faces the pillow are the usual consumer hides. Pause when the alert strengthens, lower the sensitivity, and see whether it collapses onto one object. An alarm on a router is real radio energy and the wrong conclusion if you call it a camera. Keep the antenna fitted. A BK19 review says not to switch RF on without the aerial. A HawkSpy beep that appears only when your hand is on the metal is not yet a find.
SIKVIO SIKVIO K18

Testsieger

SIKVIO SIKVIO K18
8.8/10about £44.99
View offer

Use the red window second

Use the lens window after the radio pass, in a dim room. Look through the red or infrared finder at the same clocks, alarms, and chargers. A glint is a reflection from a lens or from something else shiny. Smoke-alarm plastic, screw heads, and chrome light up if you are too close. Step back and see whether the dot stays small and round, then look in normal light for a pinhole, a lens ring, or a card slot. If you cannot find a lens control, do not invent one with a random torch. The buying choice between RF and the window is on RF detector vs lens finder.

Quirks in this set

These twelve do not share one dial. HawkSpy uses a knob, and reviews say touching the antenna sets the alarm off, so hold the body and keep fingers off the aerial. BK19 claims 10 levels, and a review warns against RF with the aerial off. Two UK reviews say that model would not hold a charge, so a dead unit is a return, not a clear room. One T19 would not shut off and reacted around LEDs. If yours will not power down, treat that as a fault. Fit the antenna, charge from the cable or your phone charger, and do not jam what you find.

What a finished sweep still is not

A finished pass means a baseline, a walk of the likely housings, and a look for a glint. It does not mean the room is clear. A camera on a card never transmits, so RF stays quiet. A camera that transmits only in a short burst can be asleep during the walk. A router's device list only shows clients on that network. A professional install is the point where a pocket unit should stop. If you find something that looks like a camera, leave it in place. The mode and the review file were chosen on the hidden camera detector buying guide.

Common questions

What should you switch off before an RF sweep?
Switch your phone to flight mode or take it out of the room, and switch off radios you control, such as a laptop or a Bluetooth speaker. Hotel Wi-Fi you cannot unplug stays as a known source you calibrate against.
Do you start at the highest sensitivity or the lowest?
Start high enough to prove the unit reacts to a known phone or router, then lower it until that source is quiet at arm's length. Starting at the top and walking makes the whole room one alarm.
How do you tell a router from a closer source?
Quiet the detector on the router first, then move. If the alert returns only against one clock or charger, and fades when you step back, that object is the nearer source.
How do you use the red window?
Dim the room, look through the red or infrared finder, and pan across objects that face the bed or the bathroom. A small glint is a reason to inspect that object in normal light for a lens, a pinhole, or a card slot.
What if the beep starts when you touch the antenna?
On the HawkSpy, reviews describe an alarm when the antenna is touched or the unit is moved. Hold the body and see whether the alert continues when the unit is still.
How long is a realistic room pass?
A few minutes at a slow pace is a rule of thumb for one hotel room, not a certified standard. You need a baseline, a close pass of clocks, alarms, and chargers, and a dim look through the lens window.
When do you stop and look with your eyes instead?
Stop trusting the beep alone when it will not separate from Wi-Fi, when a glint has given you an object, or when the hide looks built in. Look for a lens, a card slot, and where the object points.

Related pages

Hidden camera hotel room UK

Camera detector

Best hidden camera detector UK: review files first

Hidden camera detector buying guide: match the mode

RF detector vs lens finder: radio, glint, or magnet

Sources

Public UK sources from the digest, retrieved with that digest on 21 October 2026. Prices, stars and review counts are the amazon.co.uk figures stored for these twelve listings, not a live refresh.

  1. Ofcom, rules on using radio equipment (retrieved 21 October 2026)
  2. Ofcom, spectrum enforcement (retrieved 21 October 2026)
  3. Sexual Offences Act 2003, section 67 (retrieved 21 October 2026)
  4. Explanatory notes to section 67 (retrieved 21 October 2026)
  5. CPS voyeurism guidance (retrieved 21 October 2026)
  6. ICO, home CCTV systems (retrieved 21 October 2026)
  7. ICO, surveillance principles (retrieved 21 October 2026)
  8. FCDO Services, detecting hidden cameras at work (retrieved 21 October 2026)