Best Damp Meter UK 2026: Pin, Pinless or Both

Most regular kits end up with SurveyMaster on the van. Buying pin-only "for now" is how you perforate wallpaper looking for a patch you could have found in seconds.

Pin (resistance) meters pass a small current between two pins and quote %WME (wood moisture equivalent): the moisture content wood would have at that resistance. In wood that is a true moisture content. In plaster, brick or screed it is a calibrated comparison, not a percentage of water by weight. A plaster reading of "20%" does not mean the wall is one-fifth water.

Non-invasive (capacitance / RF) meters push a field a short distance into the material and report a relative number on an arbitrary scale. There is no percentage and no unit. A reading of 300 means nothing alone; 300 where the dry reference wall reads 120 means a great deal.

Never write a relative pinless number into a report as if it were a moisture percentage. Survey pinless, mark the wet zone, then take pin readings inside and outside it and report those.

Protimeter publishes colour bands used across its meters. On the Digital Mini, the pin range is 7.9% to 99% WME, with LED bands Dry 7 to 16.9, At Risk 17 to 19.9, Wet 20 to 99.9. The MMS3 quotes a pin range of 6% to 100% WME and notes readings over 30% are relative: above that the meter says "very wet" rather than a figure to quote precisely.

Around 20% WME is the decision line for most building work. Below about 17% is normal territory; 17 to 20% is worth watching; at 20% and above you have a problem to explain. Very high readings are not precise readings: 60% is not twice as wet as 30%. Record the band, photograph the location, and rely on the pattern across the wall.

Timber is the exception where the percentage is real. For structural timber and joinery use species correction charts from the maker.

Protimeter Digital Mini (BLD5775): live published figures: 7.9% to 99% WME; automatic calibration check after every 50 power cycles; Bluetooth logging to Protimeter Connect; two-year warranty; two AA cells. Accessory socket takes hammer electrode, 127 mm and 230 mm deep wall probes, and a remote pin probe.

Deep wall probes matter: surface pins read the skim; a probe into the masonry behind tells you whether the wall itself is wet. Buy this for timber and subfloors when you accept pin marks. Do not buy it alone if you survey finished rooms for clients.

Confirm current UK price on the maker page for the exact part number (bare vs kit). This guide does not invent a GBP band.

Protimeter Aquant (BLD5770): live published figures: RF measurement up to about 19 to 20 mm below the surface on a relative scale of 60 to 1000; about 195 g with battery; 190 × 70 × 49 mm; user field calibration of non-invasive mode; automatic calibration check; two-year warranty; Bluetooth logging.

Its strength is speed and no damage, including behind ceramic tile and vinyl. Protimeter's framing is right: it finds areas that need further investigation. It is a search tool, not a reporting tool alone. For most builders a dual-function meter is the better spend.

Confirm current UK price on the maker page for the exact part number.

Protimeter SurveyMaster (BLD5375): the long-standing UK default in one body: pin and non-invasive, one-handed. Current model adds a larger display, automatic calibration check every 50 power cycles, user field calibration of non-invasive mode, and battery life Protimeter states is three times longer than the previous generation. Bluetooth saves time-stamped readings. Same probe family as the Digital Mini (including about 127 mm and 240 mm deep wall probes and hammer electrode).

User field calibration of the pinless mode is what turns a meaningless relative number into a comparison against a known-dry area of the same construction.

Confirm current UK price on the maker page for the exact part number.

Protimeter MMS3 (BLD9800): live published figures: pin 6% to 100% WME; non-invasive 60 to 999 relative scale to about 19 mm in standard mode and up to about 12 cm in sensitivity mode; IR surface thermometer 12:1 distance-to-spot, −20 °C to 80 °C at ±2 °C; hygrostick RH quoted ±3% RH (30 to 40% RH) and ±2% RH (41 to 98% RH) at 20 °C; logs up to 10,000 records; about 309 g; UKCA and CE.

Condensation forms where a surface is below the dew point of the room air. With RH, air temperature and surface temperature you can separate water getting in from moisture condensing on a cold spot. Those two diagnoses lead to different jobs and different quotes. A pin reading alone cannot tell them apart.

Confirm current UK price on the maker page for the exact part number and kit contents.

A meter reports conductivity, not water.

• Hygroscopic salts from historic groundwater evaporation hold atmospheric moisture and conduct freely: the classic false positive behind unnecessary chemical DPC work
• Foil-backed plasterboard, metal lath, wall ties, conduit, pipework, fixings send pin and pinless to full scale; implausible straight lines or regular spacings usually mean metal
• Surface moisture from fresh condensation, washing or steaming reads wet while the substrate is dry
• Carbon / soot in chimney breasts and some paints conduct
• New construction screed, plaster and render read wet for weeks: that is drying, not a defect

Always take a reference reading on a wall you believe is dry, same property and same construction, and quote suspect readings against it.

GOV.UK guidance for rented housing providers is explicit that responsibility for identifying and fixing the underlying cause sits with the landlord, not with the tenant's lifestyle. A photograph of a meter showing a high number is close to worthless alone. What holds up is a pattern: the suspect area, a dry reference on the same wall type, height above floor, room air temperature and RH, and surface temperature of the cold spot if condensation is in the frame. Time-stamped logged readings beat numbers on the back of a job sheet.

1. Take room conditions first (air temperature and RH) before opening windows or running heating
2. Sweep in non-invasive mode, low to high; mark raised edges with low-tack tape
3. Find a dry reference on the same construction
4. Confirm with pins inside the wet zone, at the edge, and at the dry reference, at several heights
5. Go deeper with wall probes if surface and sweep disagree
6. Check cold spots (reveals, lintels, external corners, behind furniture) against dew point
7. Record location, value, mode and height as you go; use Bluetooth logging if you have it

Check the built-in calibration before a survey you will put in writing. Never quote a non-invasive number without saying it is relative.

1. Pin, pinless, or both, matched to whether you report findings
2. Hygrometer + IR if you diagnose condensation
3. Deep wall probes and hammer electrode available for the same accessory family
4. Automatic calibration check and user field calibration of pinless mode
5. Logging / Bluetooth if findings go to landlords or insurers
6. Exact part number and what is in the kit (bare vs probes vs pouch)

Prices move with kit contents and promotions. Check the current price on the maker's page against the exact part number.

Tradehand is not a tool shop. Once you can survey honestly, the bottleneck is booked remedial work and paid invoices. Tradehand gives trades a website and an assistant that quotes, books and chases. Trades pay no monthly fee and no lead fee. Tradehand takes 5% of invoices it collects. Start at tradehand.com/website or see pricing.

Homeowners pricing a damp investigation or making-good (not buying meters) should use Instant Quote: describe the room, whether mould or staining is visible, and whether the property is rented or owned. Tradehand texts a price from local rates, then one local builder takes the job. Searching and quoting are free for homeowners.