The more I was surprised by the TFA 305011. The processing of the device is very good. But since it mainly goes me to measurement accuracy, the hygrometer Larger plastic box was equal to the relatively well-known 75% -Luftfeuchtetest sprinkle undergone (bottom of a small rectangular plastic box with NaCl, add some water, but not so much that dissolves the salt. Take, in the hygrometer together with the small plastic box fits. Small plastic box and hygrometer juxtaposition on the upturned lid of the big box and this with the box from above airtight seal). After some time, the hygrometer hovered at 73.9% relative humidity and was only 1.1% below the real value and thus has a deviation of 1.5%. Thus, it falls below the maximum deviation of 3.5% (between 35-75% humidity), which identifies the manual. It also cut to lengths from better than the expensive real hair hygrometer from Fischer (type: 122.01HT). The analog I had simultaneously ordered from Amazon and had great hope in its precision. It showed in the above test at 81% relative humidity instead of the real 75%, even though I had it previously enabled with a humid cloth. Luckily, you can recalibrate this hygrometer.
I find it interesting when the hygrometer that it warns of potential mold growth; you can choose between an acoustic and purely visual alarm (flashing red LED) and also define if the hygrometer is already at 55% exhort or 65% for ventilation. But I'm missing a switch, with which I can turn off the alarm altogether.
The thermometer is also very accurate and has a deviation of 0.3 ° C from a quicksilver thermometer.
The display of the dew point is also a nice feature, as well as logging of min / max values of temperature and humidity.
Total convinced me this hygrometer, as it is responsive and with a deviation of 1.1% -Luftfeuchte very precise. Although it is not as fancy as our other analog hygrometer, it is currently my favorite due to its numerous abilities and his precision.
