Free private tool
See the pattern, not one reading.
Log temperature, relative humidity and what was happening in the room. Your entries stay on this device, and you can download them as a clean CSV.
Current pattern
Add readings at consistent times. Seven days is a useful starting record.
A pattern is not a diagnosis. A sensor cannot distinguish condensation from a leak, rain penetration or another building defect.
Your readings
Local history
No readings saved on this device.
A useful seven-day record
Measure at consistent times and note what changed.
Record after waking, during the afternoon and before bed. Add showers, cooking, laundry, heating, open windows, rain and visible condensation so a high or low number has context.
Repeated moisture after rain, local staining, extensive mould or health concerns need appropriate professional investigation. A dehumidifier can manage airborne moisture but cannot repair the building.
Read the measurement guide →