As far as I can tell so far, the instrument measures the values that it is actually quite reliable. Unfortunately you can not see anything remotely in the display, if you take a short look into the room to check if right now in the wintertime time venting would do well because of the humidity. Without the lights to turn on is hardly what to recognize namely on the display. Although Tollbunt when the then lit ... but I praise the other devices that are in the other areas where I can look on it from two or three yards short and can read the values. Unfortunately, not what I expected ...
