No handheld meter detects mould. What these instruments detect is moisture, in the material or in the air, and moisture is what decides whether mould grows. This hub sorts eight current listings by what each manufacturer actually claims, separates the ones that read through a surface from the ones that only read the air, and says where each stops being useful.
Find the Water
Stop the Water
The Mould Follows
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Instruments were sorted by what each manufacturer listing states it measures, whether it reads moisture in a material or only in the air, whether the reading is destructive, and what the listing leaves out. No product on this page detects mould, spores or any biological material, and none is claimed to. We did not run laboratory tests and publish no measurements of our own.
A thermal camera that points you at the damp before the moisture meter confirms it.
A non-destructive meter built for concrete slabs rather than plaster and timber.
The three readings a damp diagnosis needs, in one handheld.
No pick matches that combination yet. Try a wider budget or a different measurement.
| Product | Type | What the listing states it measures | Stated headline figure | How it reads | |
|---|---|---|---|---|---|
| FLIR MR160 imaging moisture meter | Imaging moisture meter | Moisture with infrared guided measurement | 80 x 60 Lepton thermal imager | Pin, pinless and thermal image | View |
| FLIR MR60 Moisture Meter Pro | Moisture meter | Moisture, pin and pinless, colour display | Not stated | Pin and pinless | View |
| Tramex Concrete Moisture Encounter CMEX5 | Non-destructive flooring meter | Moisture in wood or concrete flooring, slabs and screeds | Non-destructive, instant readings stated | Surface, non-destructive | View |
| Triplett MS475 | Moisture meter, psychrometer and IR thermometer | Moisture content, psychrometrics and surface temperature | Pin and pinless moisture stated | Pin, pinless and infrared | View |
| Extech RH300 psychrometer | Handheld psychrometer | Humidity, temperature, dew point and wet bulb | Dew point stated | Air only | View |
| Protmex YT606 | Hygrometer and wet bulb thermometer | Temperature, humidity and wet bulb | High precision semiconductor sensor stated | Air only | View |
| ALLOSUN digital thermometer hygrometer | Hygrometer with alarm and probe | Temperature, relative humidity and dew point | Alarm and long probe stated | Air only, remote probe | View |
| Temp Stick WiFi sensor | WiFi sensor and data logger | Temperature and humidity over time | No subscription stated | Air only, logged remotely | View |
Every figure here is taken from the manufacturer listing for that product at the time of research. No product in this table detects mould, spores or any biological material, and none of the listings claim to. Nothing on this page is a measurement of ours.
Four questions settle the purchase:
Four instruments here read moisture in a material. Four read only the air. A hygrometer will never tell you whether a wall is wet, and a pin meter will never tell you whether the room will condense.
A thermal image narrows a large wall to a small area in seconds but cannot prove moisture. A pin reading proves moisture at one point but takes all afternoon to cover a room. The MR160 does both.
Pin meters mark decorated surfaces and finished timber. Pinless and non-destructive instruments do not, which matters in occupied homes and on flooring you have just laid.
Damp arguments are won with a trend, not a reading. A logging sensor left in the room for a fortnight shows whether the problem is drying, stable or getting worse.
No, and none of the listings claim to. Every instrument on this page measures moisture, either in a material or in the air. Mould needs moisture to grow, so a wet reading identifies where mould is likely and a dry reading makes it unlikely, but confirming mould itself requires visual inspection or a laboratory sample. Anything sold as a mould detector that gives a numeric mould reading deserves suspicion.
Three products supplied with this topic were dropped as the wrong category. Two are Testo 420 flow hoods, which are ventilation balancing instruments. The third is a hay bale moisture tester with a 20 inch probe, an agricultural instrument for checking bales, which has nothing useful to say about a wall or a floor. The table shows eight genuine building instruments instead.
A pin meter passes a small current between two probes pushed into the material and infers moisture from the resistance, which gives a reading at a known depth and leaves two small holes. A pinless meter uses a radio frequency field to sense moisture below the surface without contact, covering ground quickly but responding to anything conductive behind the surface, including foil, mesh and pipes.
No. The bullet on that listing reads as though it belongs to a pH meter rather than a moisture meter, which is a listing error rather than a product description. That is why the comparison table shows Not stated for its headline figure. Where a listing bullet plainly describes a different instrument, we do not quote it.
A moisture meter, if you have visible damp and need to know where the water is. A hygrometer or psychrometer, if the damp appears in cold weather on cold surfaces and you suspect condensation rather than a leak. If you cannot tell which, the combined instruments that do both are the cheapest way to avoid buying twice.
Finding damp is two jobs. First you have to know where to look, because a wet patch on a ceiling is rarely above the leak, and pressing pins into a wall at random is a slow way to find anything. Then you have to confirm that what you found is actually moisture rather than a cold spot, a draught or missing insulation.
This instrument does both, which is what the listing means by infrared guided measurement. The stated 80 x 60 Lepton thermal core produces an image that shows temperature differences across a wall, and evaporating moisture reads cooler than the material around it. You scan, you see a pattern, and then you take a pin or pinless reading in the same place with the same tool.
The thermal resolution is modest by modern standards and the listing does not state thermal sensitivity, a moisture measurement range, an accuracy figure or the wood species corrections that a serious timber reading needs. More importantly, a thermal image is not a moisture image. Cold is not the same as wet, and an air leak or a poorly insulated stud will look similar to damp. The camera narrows the search; the moisture reading is what makes the call.
Flooring failures are expensive and they are almost always moisture failures. A slab that has not dried enough before a covering goes down will lift adhesive, cup timber and trap water where mould thrives out of sight, and the cost is measured in a whole floor rather than a patch of plaster. That is why concrete gets its own instrument.
This listing states a non-destructive digital moisture meter for instant measurement in wood or concrete flooring, slabs and screeds. Non-destructive is the operative word. The alternative for concrete is a drilled probe or an insulated hole left to equilibrate, which takes time and leaves damage; a surface instrument lets you map a whole slab quickly and find the wet areas before deciding where a definitive test is worth the disruption.
The listing does not publish a measurement depth, a scale, a calibration reference or a correlation to the relative humidity methods that flooring specifications are usually written around. That matters, because surface readings and in-slab humidity are different measurements and a manufacturer warranty will normally name one of them. Use this to survey and to decide where to test, and read the flooring specification before quoting a number back to anyone.
A damp diagnosis needs three numbers taken at the same moment: how wet the material is, what the air in the room is doing, and how cold the surface is. Take them with three instruments over ten minutes and the conditions have already moved. Take them with one and the comparison is honest.
That is what this listing offers. It states pin and pinless moisture measurement, and the product name adds a psychrometer and an infrared thermometer. With those three you can establish whether a wall is wet, whether the room air would condense on it, and whether the surface is below that dew point. The answer distinguishes a plumbing leak from a condensation problem, which are two completely different repairs and two completely different conversations with a landlord or an insurer.
The listing does not publish a moisture scale, a species correction table, an emissivity setting for the infrared sensor, or accuracy figures for any of the three functions. Emissivity is the one that bites: an infrared thermometer pointed at shiny paint, foil-backed board or gloss tile will read the reflection rather than the surface. Point it at matt surfaces or apply tape, and treat the moisture scale as relative between readings on the same material.
Short answer: the FLIR MR160 is the best general buy because it finds the area worth testing with a thermal image and then confirms it with a moisture reading in the same tool; the Tramex CMEX5 is the instrument for concrete floors, slabs and screeds; and the Triplett MS475 is the value pick because it produces the three readings a damp diagnosis needs at the same moment. None of them detect mould.
This needs saying before anything else, because the search term promises something no handheld instrument delivers. Mould is a living organism and identifying it requires seeing it, smelling it or culturing a sample. What these instruments measure is water, and water is the only variable in mould growth that a homeowner can control. Spores are present in every building already, the temperature is what it is, and the food source is the plaster, the paper and the timber. Remove the moisture and the growth stops. That is why a moisture meter is the correct tool to buy, and why a product advertised as a mould detector giving a mould number should be treated with suspicion. Our guide on whether a moisture meter can detect mould goes through it in detail.
The table splits neatly down the middle. The FLIR MR160, the FLIR MR60, the Tramex CMEX5 and the Triplett MS475 read moisture in a material by pushing pins into it or by sensing through the surface. The Extech RH300, the Protmex YT606, the ALLOSUN and the Temp Stick read the air. Both matter, and they answer different questions. A wall reading 25 percent moisture content with room air at 45 percent relative humidity has a leak. A wall reading dry with room air at 75 percent relative humidity and a cold external corner has a condensation problem. Buying only one kind of instrument means diagnosing half the cases correctly and guessing at the rest.
Pin readings are slow. Covering a whole bathroom wall at sensible spacing takes a long time and leaves a grid of holes in the decoration, which is why professional damp work starts with something that covers area quickly. A thermal camera does that: evaporating moisture cools a surface, so a damp patch usually shows as a cool region with a distinctive irregular edge. The MR160 builds that into the moisture meter, which is the sensible arrangement for anyone doing this occasionally. What thermal imaging cannot do is prove moisture, because a cold region can equally be a draught, a missing piece of insulation or a cold bridge. The image tells you where to put the pins. The pins make the call. Using a thermal camera to find insulation gaps covers the other thing those cool patches often turn out to be.
A general purpose pinless meter is calibrated around the density and electrical behaviour of timber and plaster, and concrete is neither. Slabs are also thick, so surface moisture and moisture at depth can be very different, and a covering laid over a slab that is still drying will fail months later. The Tramex CMEX5 exists for that, and its listing states non-destructive measurement in wood or concrete flooring, slabs and screeds. The honest limitation is that flooring manufacturers usually write their warranty conditions around a relative humidity measurement taken inside the slab rather than a surface reading, so a surface instrument is a survey tool that tells you where to place a definitive test, not a substitute for it.
The last three entries in the table are air instruments, and the Temp Stick in particular is there for a reason that has nothing to do with diagnosis. Once a leak is repaired or a ventilation change is made, the question becomes whether the room is actually drying, and that is a trend rather than a reading. A logging sensor left in the affected room for a fortnight produces a curve: falling humidity means the fix worked, a flat line means it did not, and a saw-tooth that peaks every evening usually means drying laundry or cooking rather than a building fault. That record is also the most persuasive thing to put in front of a landlord, an insurer or a builder, because it is difficult to argue with a fortnight of data.
Listings were compared on whether the instrument reads moisture in a material or only in the air, the measurement methods stated, whether the reading is destructive, what derived values are provided and what the listing leaves unstated. Owner feedback was reviewed for recurring reports of unreliable pinless readings and early failures. We did not run laboratory tests, we publish no measurements of our own, and no figure appears on this page unless the manufacturer published it. Amazon data supplies images, availability and links only.
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