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3 cited sources on this page · Reviewed August 16, 2026Key takeaways
The short version
- A reading is meaningless without a dry standard from the same building.
- Pinless surveys, pins confirm — they answer different questions.
- Different materials read on different scales and are not comparable.
- The log of readings over time is the evidence, not any single number.
The short answer
Direct answer
Pinless meters read moisture through a surface without damaging it and are used to survey and locate; pin meters take a reading at a specific depth and confirm it. Neither number means anything on its own — it is compared against a dry standard taken from unaffected material of the same type in the same building. That comparison, not the raw number, is what decides removal and completion.
The dry standard is the whole point
Before anything wet is read, a reading is taken from unaffected material of the same type in the same building — the same species of framing, the same drywall, the same flooring. That is the dry standard, and it is what the affected material has to come back to.
Without it there is nothing to dry to. A reading of any particular number on a piece of wood in one building can be perfectly normal and, in another, indicate a problem, because species, age and the building's own equilibrium all move the baseline.
Pinless meters: finding it
A pinless meter reads through the surface without penetrating, using the material's electrical properties across a shallow depth. Because it leaves no mark and reads quickly, it is the survey tool — scanning a wall, a floor or a ceiling to find where moisture actually is.
It is influenced by what is behind the surface, so a reading over a stud, a nail plate or foil-faced insulation can mislead. That is why what it finds is then confirmed rather than acted on directly.
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Pin meters: confirming it
A pin meter measures resistance between two probes at a known depth, which gives a reading for a specific point in the material rather than a general area. In framing it can be read at different depths to see whether moisture is at the surface or through the member.
It leaves small holes, which is why it confirms rather than surveys. Used together the two answer the two different questions: where is it, and how wet is it there.
What each instrument is for
Different tools answer different questions on the same job. None of them replaces the others.
| Instrument | What it measures | What it is used for |
|---|---|---|
| Pinless moisture meter | Moisture through a surface, over an area | Surveying and locating affected areas without damage |
| Pin moisture meter | Moisture at a specific point and depth | Confirming a survey finding and reading inside framing |
| Thermo-hygrometer | Air temperature and relative humidity | Checking whether conditions allow evaporation at all |
| Thermal imaging camera | Surface temperature differences | Spotting anomalies worth investigating — it does not see moisture |
| Manometer | Pressure difference across containment | Confirming a containment is actually under negative pressure |
What thermal imaging does and does not do
A thermal camera shows surface temperature, not moisture. Evaporating water cools a surface, so wet areas frequently appear as cooler patches — which makes the camera very good at pointing somewhere worth checking.
It is not proof. A cool patch can be a draught, a missing piece of insulation or a pipe. Anything the camera finds is confirmed with a meter before it becomes part of the scope.
Reading the log rather than a number
The useful output is the series: the same points read on each visit, with the date, alongside the dry standard and the air conditions. A single reading says where things are; the series says whether the job is working.
A reading that has stopped moving usually means a reservoir nothing has opened up yet rather than a material that has finished. Ask what the readings are showing and where — a stalled number is information.
Reading Vermont's older building materials
The region's pre-war stock complicates this in a specific way. Plaster over wood lath, board sheathing and multiple layers of added flooring all read differently from modern assemblies, hold more water, and release it far more slowly — so a reading that would signal a problem in a Williston subdivision house can be normal progress in a Burlington Hill Section house.
This is exactly why the dry standard has to come from the same building rather than a reference table. An unaffected room in the same house, on the same materials, is the only meaningful comparison.
Seasonal equilibrium matters too. Vermont buildings run at very different moisture content in February and in August, so a target established in one season is not the same number as in another, and it is established fresh on each job.
Clear answers
Common questions
What moisture reading counts as dry?
There is no universal number. Dry means back to the dry standard taken from unaffected material of the same type in the same building, which varies by material, species, building and season.
Why did they take a reading in a room that is not wet?
That is the dry standard. It is the baseline the affected material has to return to, and without it there is nothing meaningful to compare a wet reading against.
Do the pins damage my wall?
They leave small pin holes, which is why pin meters are used to confirm rather than to survey. The surveying is done with a pinless meter that leaves no mark.
Can a thermal camera see moisture?
No. It sees surface temperature differences, and evaporating water cools a surface, so wet areas often show up. A cool patch can equally be a draught or missing insulation, so every finding is confirmed with a meter.
Can I check it myself with a hardware store meter?
You can get a sense of whether something is wetter than its surroundings, which is useful. What you will not have is a dry standard, a calibrated comparison across materials or the documented series that a repair or a claim proceeds on.
The readings have not changed in two days. What does that mean?
Usually that there is a reservoir nothing has opened up — water in a cavity, under a floor or behind a cabinet that the current setup is not reaching. It is a reason to ask where the readings are being taken.
Authoritative references
Sources used on this page
Time-sensitive rules and public guidance should be checked at the source before work begins.