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How to Choose a Hygrometer for Measuring Humidity
A hygrometer tells you how damp your indoor air really is, so you can act before condensation becomes mould. Here is what to look for when choosing one.
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In short
A hygrometer measures the relative humidity of indoor air. For managing damp, look for a model that reads relative humidity and temperature clearly, is reasonably accurate across normal household ranges, and ideally logs minimum and maximum readings. Place it away from windows, radiators and external walls for a representative reading.
Key takeaways
- A hygrometer measures relative humidity (RH), usually alongside temperature.
- Aiming to keep indoor RH in a comfortable range helps limit condensation and mould.
- Look for clear readings, decent accuracy and a min/max memory.
- Placement matters — keep it away from windows, radiators and cold external walls.
A hygrometer is a small, inexpensive instrument that measures the relative humidity of the air — the amount of moisture it holds compared with the maximum it could hold at that temperature. It is the quickest way to see whether your home is too damp and to check whether your efforts (ventilation, heating, a dehumidifier) are working.
The guidance below is based on published specifications and general research, not our own testing.
What to look for
Relative humidity and temperature
Almost all household hygrometers show relative humidity (as a percentage) and temperature together. That pairing is useful, because humidity only makes sense in the context of temperature. Keeping indoor humidity within a comfortable, moderate range makes condensation and mould far less likely.
Accuracy and range
Budget hygrometers are fine for spotting trends and problems; they are not laboratory instruments. Check the stated accuracy (often given as plus or minus a few percent RH) and that the measuring range covers normal household conditions. For damp management, consistency and trend-spotting matter more than pinpoint precision.
Min/max memory and logging
A min/max memory records the highest and lowest readings since you last reset it — handy for catching a humidity spike overnight or after a shower. Some units log data over time or connect to an app, which makes it easier to see patterns.
Display and placement
Choose a display you can read at a glance. Then place the unit thoughtfully: keep it away from windows, radiators, extractor fans and cold external walls, roughly at head height in the middle of the room, so it reflects the air you actually breathe rather than a local hot or cold spot.
Note
A single reading is a snapshot. Tracking humidity over a few days tells you far more about your home than one number ever will.
Types at a glance
| Type | What it offers | Best for |
|---|---|---|
| Basic digital | RH and temperature, clear display | Everyday spot checks in one room |
| Min/max digital | Adds high/low memory | Catching overnight or post-shower spikes |
| Logging / smart | Records trends, often app-connected | Tracking patterns across rooms over time |
This compares categories by feature and intended use — there are no scores or prices here.
Using the readings
Once you can see your humidity, you can act: ventilate after cooking and bathing, deal with drying laundry indoors, and add gentle background heat to cold rooms. To track your readings over time and understand what a healthy range looks like, use our humidity tracker, and see how to stop condensation for the practical steps.
Try a related tool
Frequently asked questions
A moderate, comfortable range is the goal — too high and condensation and mould become likely, too low and the air feels dry. Rather than fixating on a single figure, watch for readings that stay high for long periods, especially in cold rooms, and ventilate and heat to bring them down.
DampSense Editorial Team
Research & editorial
Our editorial team researches UK building-moisture topics using government guidance, public-health sources and established building-science references. We write to help homeowners and tenants make informed decisions, and we flag where professional assessment is needed.
Credentials & limitations: Research-led editorial team. We are not chartered surveyors; our guides are general information, not a professional building survey.
