TFA Dostmann Digital Indoor Thermo-Hygrometer 30.5059.02 – Room Temperature and Humidity Meter with Stand and Magnet (White)

Our Verdict

You cannot see humidity until it is already condensing on the windows, so a hygrometer is the cheapest way to find out whether your drying set-up is working. Put one in the room where the washing dries and one in the coldest bedroom. The drying room will read high while the washing is wet, but if it is still up around 70% or more hours into a session, the dehumidifier is likely too small, too far away or fighting an open door; if bedrooms sit above about 60–65% for long stretches, condensation is likely to be a problem there as well. This TFA unit is a small, plain, battery-powered meter with a stand and a magnet, from an established German maker of weather instruments. Treat any budget hygrometer as a guide rather than a lab instrument: readings can be a few percent out, and some owner feedback reports units that read noticeably high or low, so if you buy two, check they agree when placed side by side. The instructions are multilingual and English may not be included, though there is little to set up.

Key Features & Irish Specs

• Shows room temperature (-10 to 50°C) and relative humidity (20 to 95%)
• Small 7.1 x 7.1cm unit, about 48g
• Fold-out stand and a magnetic back for a shelf, fridge or metal surface
• CR2032 battery included
• Listing quotes temperature accuracy of +/-1°C