we bought more of these hygrometers in order to keep especially the humidity in the eye in any room can. it puts them side by side, they all show different values for temperature and humidity. I have therefore purchased for comparison still a much more expensive, capacitive hygrometer (Testo 0560 6081 608-H1 Thermohygrometer, humidity / dew point / temperature measuring instrument, with batteries). compared all showed TFA devices 4-6% too much humidity and 0.5 to 0.3 degrees Celsius temperature too much.
which makes the TFA devices unfortunately useless for our purposes. => More more money for a decent device output. the testo works for example capacitive and self-calibrating, meaning it should be much more reliable.
