I trusted the reviews and was not disappointed - the product maintains exactly what it promises: A small thermometer and hydrometer with very legible display, even in bright light.
The thermometer helped finally the eternal winter ventilation discussion remedy, I was right, it was really cold (below 18 degrees) what motivated me to nor can they buy one and now we also have home an incorruptible temperature referee.
Strong buy recommendation, in which price do you do nothing wrong.