Product review (5 stars): Ambient Weather WS-HT12 Pocket Temperature and Humidity (Thermo-Hygrometer) Pen
For a long time I was looking for compact hygrometer to check humidity in my cigar humidifier. Finally I ordered Ambient Weather WS-HT12 Pocket Temperature and Humidity (Thermo-Hygrometer) Pen. Item arrived quickly, battery was included. Very easy to use and as a bonus you have an option to choose how  to display temperature ( Celsius or Fahrengeit ) .
Item looks solid, size is exactly what I wanted - just like cigar. Very quick response - when I move hygrometer from humidor to the room - data on the screen changes quickly. Looks like much more accurate to compare with mechanical hygrometer, which was supplied with my humidor.
The only complaint is that you cannot arrange adjustment\calibration of hygrometer.
I am completely satisfied with this product and can recommend it for those who need compact, light weight tool for checking humidity/temperature.