World wide free shipping on orders over 100€ - PayPal and Stripe payments - Made in Finland

How to measure the relative humidity percentage in the basement?

A basement that is too humid is an optimal growing environment for mould and since the air in the basement is usually colder than in the living quarters, cold and impure air migrates all around the house. Monitor your basement's relative humidity with Ruuvi Bluetooth sensors in order to make sure that the conditions are not harmful.

Basements are usually on the ground level, or below it. As a result, there are multiple ways water can get into space. With relative air humidity monitoring, you can’t ensure the moisture levels of the structures, but you can receive a good indication of possible problems arising in the basement. If you take care of your basement’s environmental conditions before more serious problems occur, you could save a fortune.

Basement renovations should almost always be left at the hands of professionals. A wrongfully executed renovation can actually increase the problems you were trying to fix. There are multiple ways of trying to decrease the humidity in a basement. These include: heating the basement, improving drainage, changing the materials inside the basement, and building a bottom well.

With Ruuvi’s sensors, you can conveniently check the relative and absolute humidity levels in the basement. Air humidity in the basement fluctuates with outside air humidity. Hence, during summer heat, the relative humidity in a basement can reach levels between 80% and 90%. If these levels of humidity are constant in the basement, problems may arise in the long run.

Ruuvi’s sensors measure air humidity and temperature. Install the sensor on a counter in the basement, or alternatively, attach it to a wall. This is the best way to measure air humidity in the basement. Ruuvi’s sensors send measurement data directly to your phone via Bluetooth. In the Ruuvi application, you can examine long-term graphs and therefore be aware of the differences in air humidity overtime. In addition, you can create alerts to alert you when your pre-set threshold is exceeded.

Measure your basement’s conditions and you will receive valuable insights regarding what is going on in your basement!

Buy Wireless Combined Thermometer And Hygrometer to Cellar
Measure humidity and receive alerts from your cellar if the conditions are not ideal with wireless hygrometer

Buy Wireless Combined Thermometer And Hygrometer to Cellar

Measure humidity and receive alerts from your cellar if the conditions are not ideal with wireless hygrometer


Tax 24% | 0%

Ruuvi is based in Finland. If you’re an EU consumer, VAT is included. If you’re a non-EU customer, you don't pay VAT. If you're an EU business, insert your VAT ID at checkout.

In stock

Add more for quantity discount!
Show bulk discount pricing table

Total: 39,90 + shipping


Add more for free shipping!

View shipping options

Made in Europe, Finland.
Worldwide free shipping on orders over 100 €.

RuuviTag is a Bluetooth sensor that monitors environmental conditions and sends the data directly to your mobile device. The Ruuvi Station mobile app allows you to view real-time accurate measurements and historical graphs. The app also provides customisable alerts to notify you of critical conditions, such as a melting freezer, excessively high bedroom temperatures that could disrupt sleep, or elevated humidity levels in your basement.

Onboard Sensors (4-in-1)

Temperature: °C, °F, K; typical accuracy ±0,2 °C @ 5-60 °C (±0.36 °F @ 41-140 °F).
Air humidity: RH-%, g/m3, dew point; typical accuracy ±3 RH-% @ 20…80 %. Range: 0-95 %.
Air pressure: Pa, hPa, mmHg, inHg; typical accuracy ±1 hPa. Range: 500-1155 hPa.
Motion: Movement counter. Counter is incremented when acceleration exceeds the threshold on any axis.

Operational Conditions

Operating temperature (with stock battery): -20 °C to +70 °C (-4 °F to 158 °F).
Absolute maximum operating temperature: -40 °C to +85 °C (-40 °F to +185 °F).
Housing: IP67, splash-proof, non-condensing location.
Battery: User-replaceable CR2477 (included). Supports extended operating temperature range battery CR2477T.
Battery lifespan: Estimated 12 to 24 months.
Bluetooth range: 5-20 meters (indoor), 20-100 meters (outdoor). The sensitivity of the receiving mobile device’s antenna, obstacles and wall materials affect the range. For increased range, use the Ruuvi Gateway router as a receiver.

App Features

Free and easy: User-friendly free app, signing in is optional.
Android and iOS.
Alerts: Configurable Bluetooth push alerts with customisable messages.
Real-time measurements: Track data in real time.
Historical data: Detailed historical graphs available for up to 10 days (offline).
History export: 10-day history export.
Dashboard: See all your sensors at a glance.
Personalise sensors: Use custom backgrounds and names.
Multilingual: Available in English, Finnish, Swedish, French, and German.


Integrations: Victron Energy, Home Assistant, Homey, and more.
Remote monitoring: When not within Bluetooth range, online remote monitoring is available with the Ruuvi Gateway and Ruuvi Cloud, both sold separately.

Technical Specifications

Data sheet: Download (pdf)
Read more info below:

You will find more use cases below