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Thermal camera vs infrared thermometer

Updated: 22 October 2026

You already own a small infrared thermometer and you want to know whether it will find the cold patch on the landing. Thermal camera vs infrared thermometer is a choice between one number and a picture of the pattern. Both tools read infrared from a surface. A gun gives you a single spot. A camera gives you a grid, which is why a warm joint or a cold edge is harder to miss. The cameras in the [FLIR thermal camera comparison](/hub/measuring-equipment/flir-thermal-camera) start at £90 on this shelf. How to choose among them is the [buying guide](/hub/measuring-equipment/flir-thermal-camera/sub/flir-thermal-camera-buying-guide). Emissivity, which fools both tools, is [how to use a thermal camera](/hub/measuring-equipment/flir-thermal-camera/sub/flir-thermal-camera-how-to-use). A qualifying purchase can earn a commission at no extra cost to you.

You already own a small infrared thermometer and you want to know whether it will find the cold patch on the landing. Thermal camera vs infrared thermometer is a choice between one number and a picture of the pattern.

Our top picks

Foxfighter Foxfighter fx1

Best overall

Foxfighter Foxfighter fx1
3.7/10about £90
View offer
Thermal Master Thermal Master Thor 002

Rank 2

Thermal Master Thermal Master Thor 002
7.2/10about £359
View offer
GOYOJO GOYOJO GW192A

Best value

GOYOJO GOYOJO GW192A
6.4/10about £129
View offer
On this page
  1. 1.One spot or a grid
  2. 2.The patch gets larger as you step back
  3. 3.Keep the gun
  4. 4.Move to a camera from this shelf

One spot or a grid

An infrared thermometer and a thermal camera are the same physics with a different output. FLIR’s own comparison calls the gun a one-pixel camera: one reading, for one patch, updated as you move your hand. The camera assigns a reading to each pixel of its detector, so a skirting that is cold only at one end shows up as a shape. You will miss that shape more often with a gun, because you have to be aimed at it at the moment you look. Neither tool sees through plaster, and neither measures the air. The gun’s gift is a quick check once you already know where to point.

The patch gets larger as you step back

A ratio such as 12:1 means that at 12 units of distance the measured spot is about 1 unit across. At arm’s length, very roughly half a metre, a 12:1 gun is averaging a patch a few centimetres wide. Step back to the far side of a room and that spot can be the size of a dinner plate or larger. A 36:1 gun shrinks the patch, and it still grows as you retreat. Each pixel of a thermal camera covers more of the wall as you step back, and a hot terminal that fills one pixel up close becomes a faint warm blur from the doorway. Move in until the thing you care about fills several pixels.
Foxfighter Foxfighter fx1

Testsieger

Foxfighter Foxfighter fx1
3.7/10about £90
View offer

Keep the gun

Keep the infrared thermometer when the question is already a place: a radiator valve, a flow pipe you can reach, the face of an oven door. Teaching sources put a basic spot gun nearer £20–£60. Bowkett’s published table runs about £14–£175, and those are his prices, not captures from this camera category. A £20 gun plus a moisture meter tells you a surface temperature and a moisture reading. A £90 camera with no stated pixel count, which is the Foxfighter in this set, adds a picture and still does not measure moisture. If you only have one radiator to check, and you can stand close enough for the spot ratio, leave the camera on the shelf.

Move to a camera from this shelf

Move to a camera when the question is where the odd patch is. A cold band along a ceiling, a warm trail that might be an underfloor loop, a socket that looks hotter than its neighbours: the gun can sample points, and the camera shows the outline in one look. On this amazon.co.uk shelf the cheapest camera is the Foxfighter at £90, with the detector size unpublished and 5.0 from four reviews. The best value, when your phone is USB-C and accepts the plug, is the GOYOJO at £129, with a stated 96×96 sensor. The Thor states 256×192. Who each listing is for is best thermal imaging camera UK.

Common questions

What does a spot gun measure that a camera also measures?
Both measure infrared from a surface and infer a temperature. The gun returns one number for one patch. The camera returns a grid. FLIR describes the gun as a one-pixel camera. Neither instrument sees through a wall or measures the air in the room. The difference is how much of the pattern you see at once.
Why can a gun miss the warm joint a camera shows immediately?
You only see the joint if the spot is on it when you look. A camera shows the joint and the cooler pipe in one frame, so the shape is obvious. You can sweep a gun and catch the same joint, and a small target is easy to pass over. That search is where the camera earns the extra money.
What does a 12:1 distance-to-spot ratio do at arm’s length?
The measured patch grows with distance. At 12 units away the spot is about 1 unit across, so at roughly half a metre a 12:1 gun is already averaging a few centimetres. From across a room the spot can swallow the target and the surface around it. Read the ratio on your own gun and stand closer.
If I only want one radiator valve, is the gun enough?
Yes, if you can get close and you already know which valve. A spot gun in the £20–£60 band cited in teaching sources is enough for a known point. A camera helps when one end of the radiator is cold and you want to see how far the cold runs. For a single valve you can aim at, keep the gun.
If I want the shape of a cold patch on a wall, why is the gun the wrong tool?
The shape is the question, and a gun has no picture to show. You would have to sample many points and sketch them. A camera shows the band, the corner, or the hatch in one frame. You still confirm damp with a meter, because a cold shape can be insulation, a lintel, or moisture.
Does a camera remove emissivity error?
It does not. Bare metal and foil reflect infrared, so a gun and a camera can both report the reflection. A setting near 0.95 fits painted plaster better than steel. The how-to page covers tape and which listings here let you change emissivity. Buying a camera leaves that error in place.
Is a cheap gun plus a moisture meter more honest than a £90 camera for damp?
For a known spot, often yes. The gun gives a temperature and the meter gives moisture, which a thermal picture does not. The £90 Foxfighter adds an image and does not state its pixels. Use a camera when you need to find the colder patch, then put the meter on that patch before you pay for works.

Related pages

Thermal imaging heat loss survey UK

FLIR thermal camera

Best thermal imaging camera UK: who each listing fits

Thermal imaging camera buying guide: job, then pixels

How to use a thermal camera: emissivity, scale, focus

Sources

Public UK sources are listed below. 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. FLIR C5 (UK) (retrieved 20 October 2026)
  2. Which?: using a thermal camera (retrieved 20 October 2026)
  3. UKTA: building thermography (retrieved 20 October 2026)
  4. UKTA: electrical thermography for practitioners (retrieved 20 October 2026)
  5. Historic England: thermal imaging (retrieved 20 October 2026)
  6. Approved Document L, Volume 1, dwellings (retrieved 20 October 2026)
  7. NHBC: thermal imaging (retrieved 20 October 2026)
  8. BBC News: sun and reflections (retrieved 20 October 2026)